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6 paź 2012 · "Returns the result for the first condition that is true. If there was no matching result value, the result after ELSE is returned, or NULL if there is no ELSE part." (http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html#operator_case)
In this article, we would like to show you UPDATE query with IF condition in MySQL. Quick solution: UPDATE `table_name` SET `column_name` = IF(condition , if_true, if_false); Practical example. To show UPDATE query with IF condition, we will use the following users table:
14 cze 2020 · How would I update a column using a CASE expression where the inner THEN clause needs to calculate a value based on that same column of other rows in the same table? i.e. Here's a list table with six children ordered by position in ascending order.
The WHERE clause, if given, specifies the conditions that identify which rows to update. With no WHERE clause, all rows are updated. If the ORDER BY clause is specified, the rows are updated in the order that is specified. The LIMIT clause places a limit on the number of rows that can be updated.
6 sty 2022 · END AS c_t FROM ( SELECT case_id, cat, birth, (SELECT COUNT(c2.case_id) FROM cas c2 WHERE c2.case_id = c1.case_id GROUP BY c2.case_id) AS c_cnt, (SELECT SUM(CASE WHEN c3.cat = 'WIFE' THEN 1 ELSE 0 END) FROM cas c3 WHERE c3.case_id = c1.case_id GROUP BY c3.case_id) AS w_cnt, (SELECT FLOOR(MIN(DATEDIFF(NOW(), c4.birth) / 365.25)) FROM cas c4 ...
7 maj 2017 · The CASE expression is a conditional expression: it evaluates data and returns a result. The result it returns is based on whether the data meets certain criteria. This expression can be used in SELECT, UPDATE, and DELETE statements or in WHERE, IN, LIKE, ORDER BY, and HAVING clauses.
UPDATE my_table. SET D = CASE. WHEN (A = 6 AND B = 1 AND C = 'red') THEN '1#2#3#5#4'. WHEN (A = 8 AND B = 1 AND C = 'green') THEN '5#6#7#8#9'. END. But this query updates all entries in the table.
