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1.8.3.4 ENUM and SET Constraints
ENUM and
SET columns provide an
efficient way to define columns that can contain only a given
set of values. See Section 11.4.4, “The ENUM Type”, and
Section 11.4.5, “The SET Type”.
With strict mode enabled (see Section 5.1.11, “Server SQL Modes”), the
definition of a ENUM or
SET column acts as a constraint
on values entered into the column. An error occurs for values
that do not satisfy these conditions:
An
ENUMvalue must be one of those listed in the column definition, or the internal numeric equivalent thereof. The value cannot be the error value (that is, 0 or the empty string). For a column defined asENUM('a','b','c'), values such as'','d', or'ax'are invalid and are rejected.A
SETvalue must be the empty string or a value consisting only of the values listed in the column definition separated by commas. For a column defined asSET('a','b','c'), values such as'd'or'a,b,c,d'are invalid and are rejected.
Errors for invalid values can be suppressed in strict mode if
you use INSERT
IGNORE or UPDATE IGNORE. In this
case, a warning is generated rather than an error. For
ENUM, the value is inserted as
the error member (0). For
SET, the value is inserted as
given except that any invalid substrings are deleted. For
example, 'a,x,b,y' results in a value of
'a,b'.
Document created the 26/06/2006, last modified the 26/10/2018
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