Difference between revisions of "Tricks and tips"
(→Permut two rows according to their id) |
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=SQL= | =SQL= | ||
==Permut two rows according to their id== | ==Permut two rows according to their id== | ||
| − | Goal: permut two rows with id | + | Goal: permut two rows with id=a and id=b using only one query |
UPDATE some_table SET id = a + ABS(id - b) WHERE order_num in (a , b) | UPDATE some_table SET id = a + ABS(id - b) WHERE order_num in (a , b) | ||
Revision as of 21:16, 16 January 2007
SQL
Permut two rows according to their id
Goal: permut two rows with id=a and id=b using only one query
UPDATE some_table SET id = a + ABS(id - b) WHERE order_num in (a , b)
