数据类型

数字。

SELECT 123456789123456789123456789123456789 AS result;

result
123456789123456789123456789123456789

1 row in set

SELECT CAST(8.123456789123456789 AS REAL) AS result;

result
8.123456789123457

1 row in set

SELECT CAST(8.123456789123456789 AS FLOAT) AS result;

result
8.12346

1 row in set