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DOUBLE PRECISION

Syntax

DOUBLE PRECISION[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]
REAL[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]

Description

REAL and DOUBLE PRECISION are synonyms for DOUBLE.

Exception: If the REAL_AS_FLOAT SQL mode is enabled, REAL is a synonym for FLOAT rather than DOUBLE.

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https://mariadb.com/kb/en/double-precision/