SQL tricks
December 5, 2022
MySQL 8: short syntax for select all
Since MySQL 8 you can use pretty short query to select all data from table.
Just use TABLE a; instead SELECT * FROM a; and get same result
mysql> table a; +===+===+ | m | n | +===+===+ | 1 | 2 | | 2 | 3 | | 3 | 4 | +---+---+ mysql> table b; +===+===+ | m | n | +===+===+ | 1 | 2 | | 1 | 3 | | 3 | 4 | +---+---+ mysql> table c; +===+===+ | m | n | +===+===+ | 1 | 3 | | 1 | 3 | | 3 | 4 | +---+---+
This syntax also can be used with UNION and INTERSECT statements
mysql> table a union all table b union all table c; +===+===+ | m | n | +===+===+ | 1 | 2 | | 2 | 3 | | 3 | 4 | | 1 | 2 | | 1 | 3 | | 3 | 4 | | 1 | 3 | | 1 | 3 | | 3 | 4 | +---+---+ mysql> table a intersect table b; +===+===+ | m | n | +===+===+ | 1 | 2 | | 3 | 4 | +---+---+