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7 lip 2010 · SELECT id FROM table WHERE (date,value) IN ( select date, max(value) from table where date = '2010-01-01' group by date ) Date twice, no Group By (preferred method): SELECT id FROM table WHERE date = '2010-01-01' AND value = ( select max(value) from table where date = '2010-01-01' )
1 lut 2010 · Here's a query to update a table based on a comparison of another table. If record is not found in tableB, it will update the "active" value to "n". If it's found, will set the value to NULL. UPDATE tableA LEFT JOIN tableB ON tableA.id = tableB.id SET active = IF(tableB.id IS NULL, 'n', NULL)"; Hope this helps someone else.
Each row can be uniquely identified by either its id or the combination of its name_id, time_stamp and event. There can be two rows with the same name_id and time_stamp if one of them has an event of 'add', 'init', 'update', 'disconnect' or 'remove' and the other one has an event of 'stopped'.
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.
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:
In MySQL, the MAX() function returns the maximum value in a set of values. The MAX() function comes in handy in many cases such as finding the highest number, the most expensive product, or the largest payment from customers. Here’s the syntax of the MAX() function :
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.
