If D is 0, the result has no decimal point or fractional part.
D can be negative to cause D digits left of the decimal point of the value X to become zero.
mysql>mysql> SELECT TRUNCATE(1.223,1);+-------------------+| TRUNCATE(1.223,1) |+-------------------+| 1.2 |+-------------------+1 row in set (0.00 sec)mysql>mysql> SELECT TRUNCATE(1.999,1);+-------------------+| TRUNCATE(1.999,1) |+-------------------+| 1.9 |+-------------------+1 row in set (0.00 sec)mysql>
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