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27 maj 2011 · 180. You can do like this. DELETE FROM table WHERE id NOT IN ( 2 ) OR. DELETE FROM table WHERE id <> 2. As @Frank Schmitt noted, you might want to be careful about the NULL values too. If you want to delete everything which is not 2 (including the NULLs) then add OR id IS NULL to the WHERE clause.
13 lip 2024 · The "not equal to" operator allows you to exclude specific values from your query results, enabling more targeted data retrieval. Syntax: The "not equal to" operator can be represented in two ways in MySQL: - '<>' - '!=' Both can be used interchangeably in most cases, but it's good practice to stick to one for consistency. MySQL Version: 8.0.
25 sty 2024 · In this tutorial, we will explore various MySQL comparison operators such as greater than (>), less than (<), equal to (=), and more, through concise explanations and code examples.
mysql> SELECT 'a' IN (0), 0 IN ('b'); -> 1, 1. In both cases, the comparison values are converted to floating-point values, yielding 0.0 in each case, and a comparison result of 1 (true). The number of values in the IN() list is only limited by the max_allowed_packet value.
4 lip 2024 · The IN() function in MySQL is an efficient way to determine if a given value exists within a specified list of values. This function enhances query readability and can often lead to performance improvements in specific scenarios.
Example. ALL. TRUE if all of the subquery values meet the condition. Try it. AND. TRUE if all the conditions separated by AND is TRUE. Try it. ANY. TRUE if any of the subquery values meet the condition.
12 wrz 2012 · This uses a LEFT OUTER join against the term relationships table (aliased as n), to find matching rows in category 109, but then excludes any rows where a match was found (via the condition in the WHERE clause, so ther rows returned from wp_posts that are those that are not in category 109.
