The default number of decimal places displayed is seven, but MySQL uses the full double-precision value internally.
mysql>mysql> SELECT PI();+----------+| PI() |+----------+| 3.141593 |+----------+1 row in set (0.00 sec)mysql> SELECT PI()+0.000000000000000000;+---------------------------+| PI()+0.000000000000000000 |+---------------------------+| 3.141592653589793100 |+---------------------------+1 row in set (0.00 sec)mysql>
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