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25 maj 2011 · Two options: Use the LIKE keyword, along with percent signs in the string. select * from table where field like '%a%' or field like '%b%'.
Base-64 encoded strings can be decoded using the FROM_BASE64() function. mysql> SELECT TO_BASE64('abc'), FROM_BASE64(TO_BASE64('abc')); -> 'JWJj', 'abc' Different base-64 encoding schemes exist. These are the encoding and decoding rules used by TO_BASE64() and FROM_BASE64():
Chapter 14 Functions and Operators. Expressions can be used at several points in SQL statements, such as in the ORDER BY or HAVING clauses of SELECT statements, in the WHERE clause of a SELECT, DELETE, or UPDATE statement, or in SET statements. Expressions can be written using values from several sources, such as literal values, column values ...
MySQL has many built-in functions. This reference contains string, numeric, date, and some advanced functions in MySQL.
Often, we need to check if a specific string contains another string within a given column. This can be useful for various scenarios, such as filtering data, validating user input, or performing text analysis.
Unlike a stored procedure, you can use a stored function in SQL statements wherever you use an expression. This enhances the readability and maintainability of the procedural code. To create a stored function, you use the CREATE FUNCTION statement. The following illustrates the basic syntax for creating a new stored function: DELIMITER $$
27 cze 2024 · In MySQL, certain functions provide crucial information about the current session which can be particularly useful when working with multiple databases or managing user permissions. Two such important functions are DATABASE() and CURRENT_USER().
