Functions for Generating Random Numbers

All functions in this section accept zero or one arguments. The only use of the argument (if provided) is to prevent common subexpression elimination such that two different executions within a row of the same random function return different random values.

Related content

• Blog: Generating random data in ClickHouse

Note

The random numbers are generated by non-cryptographic algorithms.

rand

Returns a random UInt32 number with uniform distribution.

Uses a linear congruential generator with an initial state obtained from the system, which means that while it appears random, it's not truly random and can be predictable if the initial state is known. For scenarios where true randomness is crucial, consider using alternative methods like system-level calls or integrating with external libraries.

Syntax

rand()

Alias: rand32

Arguments

None.

Returned value

Returns a number of type UInt32.

Example

SELECT rand();

1569354847 -- Note: The actual output will be a random number, not the specific number shown in the example

rand64

Returns a random UInt64 integer (UInt64) number

Syntax

rand64()

Arguments

None.

Arguments

Returns a number UInt64 number with uniform distribution.

Uses a linear congruential generator with an initial state obtained from the system, which means that while it appears random, it's not truly random and can be predictable if the initial state is known. For scenarios where true randomness is crucial, consider using alternative methods like system-level calls or integrating with external libraries.

Example

SELECT rand64();

15030268859237645412 -- Note: The actual output will be a random number, not the specific number shown in the example.

randCanonical

Returns a random Float64 number.

Syntax

randCanonical()

Arguments

None.

Arguments

Returns a Float64 value between 0 (inclusive) and 1 (exclusive).

Example

SELECT randCanonical();

0.3452178901234567 - Note: The actual output will be a random Float64 number between 0 and 1, not the specific number shown in the example.

randConstant

Generates a single constant column filled with a random value. Unlike rand, this function ensures the same random value appears in every row of the generated column, making it useful for scenarios requiring a consistent random seed across rows in a single query.

Syntax

randConstant([x]);

Arguments

• [x] (Optional): An optional expression that influences the generated random value. Even if provided, the resulting value will still be constant within the same query execution. Different queries using the same expression will likely generate different constant values.

Arguments

Returns a column of type UInt32 containing the same random value in each row.

Implementation details

The actual output will be different for each query execution, even with the same optional expression. The optional parameter may not significantly change the generated value compared to using randConstant alone.

Example

SELECT randConstant() AS random_value;

| random_value |
|--------------|
| 1234567890   |

SELECT randConstant(10) AS random_value;

| random_value |
|--------------|
| 9876543210   |

randUniform

Returns a random Float64 drawn uniformly from interval [min, max].

Syntax

randUniform(min, max)

Arguments

• min - Float64 - left boundary of the range,
• max - Float64 - right boundary of the range.

Returned value

A random number of type Float64.

Example

SELECT randUniform(5.5, 10) FROM numbers(5)

┌─randUniform(5.5, 10)─┐
│    8.094978491443102 │
│   7.3181248914450885 │
│    7.177741903868262 │
│    6.483347380953762 │
│    6.122286382885112 │
└──────────────────────┘

randNormal

Returns a random Float64 drawn from a normal distribution.

Syntax

randNormal(mean, stddev)

Arguments

• mean - Float64 - mean value of distribution,
• stddev - Float64 - standard deviation of the distribution.

Returned value

• Random number. Float64.

Example

SELECT randNormal(10, 2) FROM numbers(5)

Result:

┌──randNormal(10, 2)─┐
│ 13.389228911709653 │
│  8.622949707401295 │
│ 10.801887062682981 │
│ 4.5220192605895315 │
│ 10.901239123982567 │
└────────────────────┘

randLogNormal

Returns a random Float64 drawn from a log-normal distribution.

Syntax

randLogNormal(mean, stddev)

Arguments

• mean - Float64 - mean value of distribution,
• stddev - Float64 - standard deviation of the distribution.

Returned value

• Random number. Float64.

Example

SELECT randLogNormal(100, 5) FROM numbers(5)

Result:

┌─randLogNormal(100, 5)─┐
│  1.295699673937363e48 │
│  9.719869109186684e39 │
│  6.110868203189557e42 │
│  9.912675872925529e39 │
│ 2.3564708490552458e42 │
└───────────────────────┘

randBinomial

Returns a random UInt64 drawn from a binomial distribution.

Syntax

randBinomial(experiments, probability)

Arguments

• experiments - UInt64 - number of experiments,
• probability - Float64 - probability of success in each experiment, a value between 0 and 1.

Returned value

• Random number. UInt64.

Example

SELECT randBinomial(100, .75) FROM numbers(5)

Result:

┌─randBinomial(100, 0.75)─┐
│                      74 │
│                      78 │
│                      76 │
│                      77 │
│                      80 │
└─────────────────────────┘

randNegativeBinomial

Returns a random UInt64 drawn from a negative binomial distribution.

Syntax

randNegativeBinomial(experiments, probability)

Arguments

• experiments - UInt64 - number of experiments,
• probability - Float64 - probability of failure in each experiment, a value between 0 and 1.

Returned value

• Random number. UInt64.

Example

SELECT randNegativeBinomial(100, .75) FROM numbers(5)

Result:

┌─randNegativeBinomial(100, 0.75)─┐
│                              33 │
│                              32 │
│                              39 │
│                              40 │
│                              50 │
└─────────────────────────────────┘

randPoisson

Returns a random UInt64 drawn from a Poisson distribution.

Syntax

randPoisson(n)

Arguments

• n - UInt64 - mean number of occurrences.

Returned value

• Random number. UInt64.

Example

SELECT randPoisson(10) FROM numbers(5)

Result:

┌─randPoisson(10)─┐
│               8 │
│               8 │
│               7 │
│              10 │
│               6 │
└─────────────────┘

randBernoulli

Returns a random UInt64 drawn from a Bernoulli distribution.

Syntax

randBernoulli(probability)

Arguments

• probability - Float64 - probability of success, a value between 0 and 1.

Returned value

• Random number. UInt64.

Example

SELECT randBernoulli(.75) FROM numbers(5)

Result:

┌─randBernoulli(0.75)─┐
│                   1 │
│                   1 │
│                   0 │
│                   1 │
│                   1 │
└─────────────────────┘

randExponential

Returns a random Float64 drawn from a exponential distribution.

Syntax

randExponential(lambda)

Arguments

• lambda - Float64 - lambda value.

Returned value

• Random number. Float64.

Example

SELECT randExponential(1/10) FROM numbers(5)

Result:

┌─randExponential(divide(1, 10))─┐
│              44.71628934340778 │
│              4.211013337903262 │
│             10.809402553207766 │
│              15.63959406553284 │
│             1.8148392319860158 │
└────────────────────────────────┘

randChiSquared

Returns a random Float64 drawn from a Chi-square distribution - a distribution of a sum of the squares of k independent standard normal random variables.

Syntax

randChiSquared(degree_of_freedom)

Arguments

• degree_of_freedom - Float64 - degree of freedom.

Returned value

• Random number. Float64.

Example

SELECT randChiSquared(10) FROM numbers(5)

Result:

┌─randChiSquared(10)─┐
│ 10.015463656521543 │
│  9.621799919882768 │
│   2.71785015634699 │
│ 11.128188665931908 │
│  4.902063104425469 │
└────────────────────┘

randStudentT

Returns a random Float64 drawn from a Student's t-distribution.

Syntax

randStudentT(degree_of_freedom)

Arguments

• degree_of_freedom - Float64 - degree of freedom.

Returned value

• Random number. Float64.

Example

SELECT randStudentT(10) FROM numbers(5)

Result:

┌─────randStudentT(10)─┐
│   1.2217309938538725 │
│   1.7941971681200541 │
│ -0.28192176076784664 │
│   0.2508897721303792 │
│  -2.7858432909761186 │
└──────────────────────┘

randFisherF

Returns a random Float64 drawn from a F-distribution.

Syntax

randFisherF(d1, d2)

Arguments

• d1 - Float64 - d1 degree of freedom in X = (S1 / d1) / (S2 / d2),
• d2 - Float64 - d2 degree of freedom in X = (S1 / d1) / (S2 / d2),

Returned value

• Random number. Float64.

Example

SELECT randFisherF(10, 3) FROM numbers(5)

Result:

┌──randFisherF(10, 3)─┐
│   7.286287504216609 │
│ 0.26590779413050386 │
│ 0.22207610901168987 │
│  0.7953362728449572 │
│ 0.19278885985221572 │
└─────────────────────┘

randomString

Generates a string of the specified length filled with random bytes (including zero bytes). Not all characters may be printable.

Syntax

randomString(length)

Arguments

• length — String length in bytes. Positive integer.

Returned value

• String filled with random bytes. String.

Example

Query:

SELECT randomString(30) AS str, length(str) AS len FROM numbers(2) FORMAT Vertical;

Result:

Row 1:
──────
str: 3 G  :   pT ?w тi  k aV f6
len: 30

Row 2:
──────
str: 9 ,]    ^   )  ]??  8
len: 30

randomFixedString

Generates a binary string of the specified length filled with random bytes (including zero bytes). Not all characters may be printable.

Syntax

randomFixedString(length);

Arguments

• length — String length in bytes. UInt64.

Returned value(s)

• String filled with random bytes. FixedString.

Example

Query:

SELECT randomFixedString(13) AS rnd, toTypeName(rnd)

Result:

┌─rnd──────┬─toTypeName(randomFixedString(13))─┐
│ j▒h㋖HɨZ'▒ │ FixedString(13)                 │
└──────────┴───────────────────────────────────┘

randomPrintableASCII

Generates a string with a random set of ASCII characters. All characters are printable. If you pass length < 0, the behavior of the function is undefined.

Syntax

randomPrintableASCII(length)

Arguments

• length — String length in bytes. Positive integer.

Returned value

• String with a random set of ASCII printable characters. String

Example

SELECT number, randomPrintableASCII(30) AS str, length(str) FROM system.numbers LIMIT 3

┌─number─┬─str────────────────────────────┬─length(randomPrintableASCII(30))─┐
│      0 │ SuiCOSTvC0csfABSw=UcSzp2.`rv8x │                               30 │
│      1 │ 1Ag NlJ &RCN:*>HVPG;PE-nO"SUFD │                               30 │
│      2 │ /"+<"wUTh:=LjJ Vm!c&hI*m#XTfzz │                               30 │
└────────┴────────────────────────────────┴──────────────────────────────────┘

randomStringUTF8

Generates a random string of a specified length. Result string contains valid UTF-8 code points. The value of code points may be outside of the range of assigned Unicode.

Syntax

randomStringUTF8(length);

Arguments

• length — Length of the string in code points. UInt64.

Returned value(s)

• UTF-8 random string. String.

Example

Query:

SELECT randomStringUTF8(13)

Result:

┌─randomStringUTF8(13)─┐
│ 𘤗𙉝д兠庇󡅴󱱎󦐪􂕌𔊹𓰛   │
└──────────────────────┘

fuzzBits

Syntax

Flips the bits of String or FixedString s, each with probability prob.

Syntax

fuzzBits(s, prob)

Arguments

• s - String or FixedString,
• prob - constant Float32/64 between 0.0 and 1.0.

Returned value

Fuzzed string with same type as s.

Example

SELECT fuzzBits(materialize('abacaba'), 0.1)
FROM numbers(3)

Result:

┌─fuzzBits(materialize('abacaba'), 0.1)─┐
│ abaaaja                               │
│ a*cjab+                               │
│ aeca2A                                │
└───────────────────────────────────────┘

fuzzBits

Introduced in: v20.5

Flips the bits of the input string s, with probability p for each bit.

Syntax

fuzzBits(s, p)

Arguments

• s — String or FixedString to perform bit fuzzing on String or FixedString
• p — Probability of flipping each bit as a number between 0.0 and 1.0 Float*

Returned value

Returns a Fuzzed string with same type as s. String or FixedString

Examples

Usage example

SELECT fuzzBits(materialize('abacaba'), 0.1)
FROM numbers(3)

┌─fuzzBits(materialize('abacaba'), 0.1)─┐
│ abaaaja                               │
│ a*cjab+                               │
│ aeca2A                                │
└───────────────────────────────────────┘

rand

Introduced in: v1.1

Returns a random UInt32 number with uniform distribution.

Uses a linear congruential generator with an initial state obtained from the system, which means that while it appears random, it's not truly random and can be predictable if the initial state is known. For scenarios where true randomness is crucial, consider using alternative methods like system-level calls or integrating with external libraries.

Syntax

rand([x])

Arguments

• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random number of type UInt32. UInt32

Examples

Usage example

SELECT rand();

1569354847

rand64

Introduced in: v1.1

Returns a random distributed UInt64 number with uniform distribution.

Uses a linear congruential generator with an initial state obtained from the system, which means that while it appears random, it's not truly random and can be predictable if the initial state is known. For scenarios where true randomness is crucial, consider using alternative methods like system-level calls or integrating with external libraries.

Syntax

rand64([x])

Arguments

• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random UInt64 number with uniform distribution. UInt64

Examples

Usage example

SELECT rand64();

15030268859237645412

randBernoulli

Introduced in: v22.10

Returns a random Float64 number drawn from a Bernoulli distribution.

Syntax

randBernoulli(probability[, x])

Arguments

• probability — The probability of success as a value between 0 and 1. Float64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified Bernoulli distribution. UInt64

Examples

Usage example

SELECT randBernoulli(.75) FROM numbers(5)

┌─randBernoulli(0.75)─┐
│                   1 │
│                   1 │
│                   0 │
│                   1 │
│                   1 │
└─────────────────────┘

randBinomial

Introduced in: v22.10

Returns a random Float64 number drawn from a binomial distribution.

Syntax

randBinomial(experiments, probability[, x])

Arguments

• experiments — The number of experiments UInt64
• probability — The probability of success in each experiment as a value between 0 and 1 Float64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified binomial distribution. UInt64

Examples

Usage example

SELECT randBinomial(100, .75) FROM numbers(5)

┌─randBinomial(100, 0.75)─┐
│                      74 │
│                      78 │
│                      76 │
│                      77 │
│                      80 │
└─────────────────────────┘

randCanonical

Introduced in: v22.11

Returns a random distributed Float64 number with uniform distribution between 0 (inclusive) and 1 (exclusive).

Syntax

randCanonical([x])

Arguments

• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number. Float64

Examples

Usage example

SELECT randCanonical();

0.345217890123456

randChiSquared

Introduced in: v22.10

Returns a random Float64 number drawn from a chi-square distribution.

Syntax

randChiSquared(degree_of_freedom[, x])

Arguments

• degree_of_freedom — Degrees of freedom. Float64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified chi-square distribution. Float64

Examples

Usage example

SELECT randChiSquared(10) FROM numbers(5)

┌─randChiSquared(10)─┐
│ 10.015463656521543 │
│  9.621799919882768 │
│   2.71785015634699 │
│ 11.128188665931908 │
│  4.902063104425469 │
└────────────────────┘

randConstant

Introduced in: v1.1

Generates a single random value that remains constant across all rows in the current query execution.

This function:

• Returns the same random value for every row within a single query
• Produces different values across separate query executions

It is useful for applying consistent random seeds or identifiers across all rows in a dataset

Syntax

randConstant([x])

Arguments

• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a column of type UInt32 containing the same random value in each row. UInt32

Examples

Basic usage

SELECT randConstant() AS random_value;

| random_value |
|--------------|
| 1234567890   |

Usage with parameter

SELECT randConstant(10) AS random_value;

| random_value |
|--------------|
| 9876543210   |

randExponential

Introduced in: v22.10

Returns a random Float64 number drawn from an exponential distribution.

Syntax

randExponential(lambda[, x])

Arguments

• lambda — Rate parameter or lambda value of the distribution Float64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified exponential distribution. Float64

Examples

Usage example

SELECT randExponential(1/10) FROM numbers(5)

┌─randExponential(divide(1, 10))─┐
│              44.71628934340778 │
│              4.211013337903262 │
│             10.809402553207766 │
│              15.63959406553284 │
│             1.8148392319860158 │
└────────────────────────────────┘

randFisherF

Introduced in: v22.10

Returns a random Float64 number drawn from an F-distribution.

Syntax

randFisherF(d1, d2[, x])

Arguments

• d1 — d1 degree of freedom in X = (S1 / d1) / (S2 / d2). Float64
• d2 — d2 degree of freedom in X = (S1 / d1) / (S2 / d2). Float64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified F-distribution Float64

Examples

Usage example

SELECT randFisherF(10, 3) FROM numbers(5)

┌─randFisherF(10, 20)─┐
│  0.7204609609506184 │
│  0.9926258472572916 │
│  1.4010752726735863 │
│ 0.34928401507025556 │
│  1.8216216009473598 │
└─────────────────────┘

randLogNormal

Introduced in: v22.10

Returns a random Float64 number drawn from a log-normal distribution.

Syntax

randLogNormal(mean, stddev[, x])

Arguments

• mean — The mean value of distribution. Float64
• stddev — The standard deviation of the distribution. Float64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified log-normal distribution. Float64

Examples

Usage example

SELECT randLogNormal(100, 5) FROM numbers(5)

┌─randLogNormal(100, 5)─┐
│  1.295699673937363e48 │
│  9.719869109186684e39 │
│  6.110868203189557e42 │
│  9.912675872925529e39 │
│ 2.3564708490552458e42 │
└───────────────────────┘

randNegativeBinomial

Introduced in: v22.10

Returns a random Float64 number drawn from a negative binomial distribution.

Syntax

randNegativeBinomial(experiments, probability[, x])

Arguments

• experiments — The number of experiments. UInt64
• probability — The probability of failure in each experiment as a value between 0and1. [Float64`](/sql-reference/data-types/float)
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified negative binomial distribution UInt64

Examples

Usage example

SELECT randNegativeBinomial(100, .75) FROM numbers(5)

┌─randNegativeBinomial(100, 0.75)─┐
│                              33 │
│                              32 │
│                              39 │
│                              40 │
│                              50 │
└─────────────────────────────────┘

randNormal

Introduced in: v22.10

Returns a random Float64 number drawn from a normal distribution.

Syntax

randNormal(mean, stddev[, x])

Arguments

• mean — The mean value of distribution Float64
• stddev — The standard deviation of the distribution Float64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified normal distribution. Float64

Examples

Usage example

SELECT randNormal(10, 2) FROM numbers(5)

┌──randNormal(10, 2)─┐
│ 13.389228911709653 │
│  8.622949707401295 │
│ 10.801887062682981 │
│ 4.5220192605895315 │
│ 10.901239123982567 │
└────────────────────┘

randPoisson

Introduced in: v22.10

Returns a random Float64 number drawn from a Poisson distribution distribution.

Syntax

randPoisson(n[, x])

Arguments

• n — The mean number of occurrences. UInt64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified Poisson distribution. UInt64

Examples

Usage example

SELECT randPoisson(10) FROM numbers(5)

┌─randPoisson(10)─┐
│               8 │
│               8 │
│               7 │
│              10 │
│               6 │
└─────────────────┘

randStudentT

Introduced in: v22.10

Returns a random Float64 number drawn from a Student's t-distribution.

Syntax

randStudentT(degree_of_freedom[, x])

Arguments

• degree_of_freedom — Degrees of freedom. Float64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random Float64 number drawn from the specified Student's t-distribution. Float64

Examples

Usage example

SELECT randStudentT(10) FROM numbers(5)

┌─────randStudentT(10)─┐
│   1.2217309938538725 │
│   1.7941971681200541 │
│ -0.28192176076784664 │
│   0.2508897721303792 │
│  -2.7858432909761186 │
└──────────────────────┘

randUniform

Introduced in: v22.10

Returns a random Float64 number drawn uniformly from the interval $[\min, \max]$.

Syntax

randUniform(min, max[, x])

Arguments

• min — Left boundary of the range (inclusive). Float64
• max — Right boundary of the range (inclusive). Float64
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a random number drawn uniformly from the interval formed by min and max. Float64

Examples

Usage example

SELECT randUniform(5.5, 10) FROM numbers(5)

┌─randUniform(5.5, 10)─┐
│    8.094978491443102 │
│   7.3181248914450885 │
│    7.177741903868262 │
│    6.483347380953762 │
│    6.122286382885112 │
└──────────────────────┘

randomFixedString

Introduced in: v20.5

Generates a random fixed-size string with the specified number of character. The returned characters are not necessarily ASCII characters, i.e. they may not be printable.

Syntax

randomFixedString(length)

Arguments

• length — Length of the string in bytes. UInt*

Returned value

Returns a string filled with random bytes. FixedString

Examples

Usage example

SELECT randomFixedString(13) AS rnd, toTypeName(rnd)

┌─rnd──────┬─toTypeName(randomFixedString(13))─┐
│ j▒h㋖HɨZ'▒ │ FixedString(13)                 │
└──────────┴───────────────────────────────────┘

randomPrintableASCII

Introduced in: v20.1

Generates a random ASCII string with the specified number of characters.

If you pass length < 0, the behavior of the function is undefined.

Syntax

randomPrintableASCII(length[, x])

Arguments

• length — String length in bytes. (U)Int*
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a string with a random set of ASCII printable characters. String

Examples

Usage example

SELECT number, randomPrintableASCII(30) AS str, length(str) FROM system.numbers LIMIT 3

┌─number─┬─str────────────────────────────┬─length(randomPrintableASCII(30))─┐
│      0 │ SuiCOSTvC0csfABSw=UcSzp2.`rv8x │                               30 │
│      1 │ 1Ag NlJ &RCN:*>HVPG;PE-nO"SUFD │                               30 │
│      2 │ /"+<"with:=LjJ Vm!c&hI*m#XTfzz │                               30 │
└────────┴────────────────────────────────┴──────────────────────────────────┘

randomString

Introduced in: v20.5

Generates a random string with the specified number of characters. The returned characters are not necessarily ASCII characters, i.e. they may not be printable.

Syntax

randomString(length[, x])

Arguments

• length — Length of the string in bytes. (U)Int*
• x — Optional and ignored. The only purpose of the argument is to prevent common subexpression elimination when the same function call is used multiple times in a query. Any

Returned value

Returns a string filled with random bytes. String

Examples

Usage example

SELECT randomString(5) AS str FROM numbers(2)

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randomStringUTF8

Introduced in: v20.5

Generates a random UTF-8 string with the specified number of codepoints. No codepoints from unassigned planes (planes 4 to 13) are returned. It is still possible that the client interacting with ClickHouse server is not able to display the produced UTF-8 string correctly.

Syntax

randomStringUTF8(length)

Arguments

• length — Length of the string in code points. (U)Int*

Returned value

Returns a string filled with random UTF-8 codepoints. String

Examples

Usage example

SELECT randomStringUTF8(13)

┌─randomStringUTF8(13)─┐
│ 𘤗𙉝д兠庇󡅴󱱎󦐪􂕌𔊹𓰛       │
└──────────────────────┘