Type conversion
Command: CAST(expr AS type)
Function: Mainly used for display type conversion
Application scenario: display type Conversion
Example:
mysql> select cast(18700000000 as char); +---------------------------+ | cast(18700000000 as char) | +---------------------------+ | 18700000000 | +---------------------------+ 1 row in set (0.00 sec)
It should be noted that type does not support all basic data types
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