General MySQL Oracle SQL Server

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GET_LOCK() - Requesting User Defined Lock
How to request a user defined lock using the GET_LOCK() function? GET_LOCK(lock, timeout) is a MySQL built-in function that tries to obtain a user defined lock within a timeout period. It returns 1 if successful, 0 if failed. For example: SELECT GET_LOCK('MyLock', 60), IS_FREE_LOCK('MyLock'), IS_USE... 2023-12-20, 2127🔥, 0💬

CONNECTION_ID() - Thread ID of Current Connection
How to obtain the connection ID of the current connection using the CONNECTION_ID() function? CONNECTION_ID() is a MySQL built-in function that returns the connection ID of the current connection. The connection ID is also referred as thread ID or process ID. For example: SELECT CONNECTION_ID(); -- ... 2024-07-15, 2117🔥, 0💬

VARIANCE() - Synonym for VAR_POP()
What's the difference between VARIANCE() and VAR_POP() functions? VARIANCE(expr) is a synonym for the VAR_POP(expr) function. Related MySQL functions: VAR_POP() - Population Standard Variance   ⇒ Window Functions ⇐ VAR_SAMP() - Sample Standard Variance ⇑ MySQL Functions on Aggregation Groups ⇑⇑ My... 2023-12-01, 2115🔥, 0💬

LEAD() - N-Row after Current Row within Window
How to evaluate a field expression on n-row after the current row in the current result set window using the LEAD() function? LEAD(exp, n, default) is a MySQL built-in window function that evaluates a field expression on n-row after the current row in the current result set window. For example: SELE... 2024-09-28, 2111🔥, 0💬

INET6_ATON() - IPv6 Address String to Number
How to convert an IPv6 address from string format to number using the INET6_ATON() function? INET6_ATON(ip) is a MySQL built-in function that converts an IPv6 address from string format to number. But an IPv6 number is too big to be represented in decimal digits. So it is stored as a byte sequence, ... 2026-04-13, 2107🔥, 0💬

IF() - Conditional Value Selection
How to conditionally select a value using the IF() function? IF(cond, val1, val2) is a MySQL built-in function that returns the second argument if the first argument is TRUE, the third argument otherwise. The first argument is treated as an integer and evaluated to TRUE if it is not 0. For example: ... 2026-10-24, 2100🔥, 0💬

LEAST() - Finding the Least/Minimum Value
How to find the least (minimum) value of a given list of values using the LEAST() function? LEAST(val1, val2, ...) is a MySQL built-in function that returns the least (minimum) value of a given list of values. For example: SELECT LEAST(70, 89, 73, 99, 101, 110, 116, 101, 114); -- +------------------... 2023-12-19, 2094🔥, 0💬

MySQL Functions on Result Set Windows
Where to find reference information and tutorials on MySQL database functions on Result Set Windows? I want to know how to use FIRST_VALUE(), ROW_NUMBER() and other window functions. Here is a collection of reference information and tutorials on MySQL database functions on Result Set Windows compile... 2024-05-15, 2079🔥, 0💬

RELEASE_LOCK() - Release Lock Instance
How to release an instance of a given lock associated with the current connection session using the RELEASE_LOCK() function? RELEASE_LOCK(lock) is a MySQL built-in function that releases an instance of a given lock associated with the current connection session. It returns 1 if released Successfully... 2023-12-20, 2078🔥, 0💬

Removed: ENCRYPT() - Unix crypt() Hash Algorithm
How to generate a hash value with the Unix crypt() algorithm using the ENCRYPT() function? ENCRYPT(bytes) is a MySQL built-in function that generates a hash value with the Unix crypt() algorithm. Note that ENCRYPT() is no longer supported. It was: Introduced MySQL 4.0. Removed in MySQL 8.0. Related ... 2024-05-15, 2073🔥, 0💬

GREATEST() - Finding the Greatest/Maximum Value
How to find the greatest (maximum) value of a given list of values using the GREATEST() function? GREATEST(val1, val2, ...) is a MySQL built-in function that returns the greatest (maximum) value of a given list of values. For example: SELECT GREATEST(70, 89, 73, 99, 101, 110, 116, 101, 114); -- +---... 2026-07-13, 2055🔥, 0💬

SQRT() - Square Root of X
How to calculate the square root of a given number using the SQRT() function? SQRT(X) is a MySQL built-in function that calculates the square root of a given number. For example: SELECT SQRT(2), SQRT(4), SQRT(8); -- +--------------------+-------- -+--------------------+-- | SQRT(2) | SQRT(4) | SQRT(... 2023-11-14, 2054🔥, 0💬

NTH_VALUE() - N-th Value of Result Set Window
How to obtain the n-th value of a field expression in the current result set window using the NTH_VALUE() function? NTH_VALUE(exp, n) is a MySQL built-in window function that returns the n-th value of a field expression in the current result set window. For example: SELECT help_topic_id AS tip, help... 2024-09-12, 2038🔥, 0💬

TRUNCATE() - Truncating to Decimal Place
How to truncate a value to a given decimal place using the TRUNCATE() function? TRUNCATE(X, D) is a MySQL built-in function that truncates X to decimal place of D. For example: SELECT TRUNCATE(-1.58, 0), TRUNCATE(23.298, 1), TRUNCATE(23.298, -1); -- +--------------------+-------- -------------+------... 2023-11-14, 2038🔥, 0💬

NULLIF() - NULL on Equal Values
How to generate NULL with equal values using the NULLIF() function? NULLIF(val1, val2) is a MySQL built-in function that returns NULL if the first argument equals the second, the first argument otherwise. For example: SELECT NULLIF('yes', 'yes'), NULLIF('yes', 'no'); -- +----------------------+-----. .. 2023-12-19, 2006🔥, 0💬

CUME_DIST() - Cumulative Distribution of Sorted Values
How to calculate the cumulative distribution of the sorting field expression in the current result set window using the CUME_DIST() function? CUME_DIST() is a MySQL built-in window function that calculates the cumulative distribution of the sorting field expression in the current result set window. ... 2024-05-15, 1984🔥, 0💬

CAST() - Casting Expression to Value
How to cast an expression to a value of the given data type using the CAST() function? CAST(exp AS type) is a MySQL built-in function that casts an expression to a value of the given data type. For example: SET @exp = '-1.99 USD'; SELECT @exp, CAST(@exp AS SIGNED INTEGER), CAST(@exp AS UNSIGNED INTE... 2026-03-22, 1979🔥, 0💬

VAR_POP() - Population Standard Variance
How to calculate the population standard variance of a field expression in result set groups using the VAR_POP() function? VAR_POP(expr) is a MySQL built-in aggregate function that calculates the population standard variance of a field expression in result set groups. For example: SELECT help_catego... 2023-12-01, 1968🔥, 0💬

UPPER() - Convert String to Upper Case
How to convert a string to upper case using the UPPER() function? UPPER(str) is a MySQL built-in function that converts all characters of a given into upper case characters. For example: SET @str = 'dba.FYIcenter.com'; SELECT UPPER(@str); -- +-------------------+ -- | UPPER(@str) | -- +-------------... 2023-11-13, 1964🔥, 0💬

EXPORT_SET() - Exporting Binary Set to On/Off Flags
How to export an integer as a binary set to on/off flags using the EXPORT_SET() function? EXPORT_SET(bits, on, off, delimiter, len) is a MySQL built-in function that converts an integer as a binary set (a sequence of bits) to on/off flags. It loops through every bit of the given integer "bits" start... 2023-12-20, 1923🔥, 0💬

TAN() - Tangent Trigonometric Value
How to calculate the tangent trigonometric value of a given angle using the TAN() function? TAN(X) is a MySQL built-in function that calculates the tangent trigonometric value of a given angle in radians. For example: SELECT TAN(0.1), TAN(1.57), TAN(3.14); -- +---------------------+------- ----------... 2023-11-14, 1873🔥, 0💬

ROW_NUMBER() - Row Position in Result Set Window
How to obtain the row position of the current row in the current result set window using the ROW_NUMBER() function? ROW_NUMBER(n) is a MySQL built-in window function that returns the row position of the current row in the current result set window. For example: SELECT help_topic_id AS tic, help_cate... 2024-09-12, 1837🔥, 0💬

IS_IPV4_MAPPED() - IPv4-Mapped IPv6 Address
How to detect an IPv6 Address that is IPv4 compatible using the IS_IPV4_MAPPED() function? IS_IPV4_MAPPED(ip) is a MySQL built-in function that returns 1 if the given IPv6 address is IPv4-mapped, 0 otherwise. The IPv6 address must be given in number format. An IPv4-mapped IPv6 address has 10 leading... 2026-04-13, 1815🔥, 0💬

ISNULL() - Detecting NULL Value
How to detect a NULL value using the ISNULL() function? ISNULL(val) is a MySQL built-in function that returns 1 if the given value is NULL, 0 otherwise. For example: SELECT ISNULL(1+1); -- +-------------+ -- | ISNULL(1+1) | -- +-------------+ -- | 0 | -- +-------------+ SELECT ISNULL(1/0); -- +-----... 2026-07-13, 1811🔥, 0💬

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General MySQL Oracle SQL Server