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In MySQL-4.x and earlier, NCHAR
and CHAR
were synonymous. ANSI
defines NCHAR
or NATIONAL CHAR
as a way to define that a
CHAR
column should use some predefined character set. MySQL uses utf8
as
that predefined character set. For example, these column type declarations
are equivalent:
CHAR(10) CHARACTER SET utf8 NATIONAL CHARACTER(10) NCHAR(10) |
As are these:
VARCHAR(10) CHARACTER SET utf8 NATIONAL VARCHAR(10) NCHAR VARCHAR(10) NATIONAL CHARACTER VARYING(10) NATIONAL CHAR VARYING(10) |
You can use N'literal'
to create a string in
national character set.
These two statements are equivalent:
SELECT N'some text'; SELECT _utf8'some text'; |