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NULL
Values
The NULL
value means "no data."
NULL
can be written in any lettercase.
Be aware that the NULL
value is different than values such
as 0
for numeric types or the empty string for string types.
See section Problems with NULL
.
NULL
may be represented by \N
when using the text file import
or export formats (LOAD DATA INFILE
, SELECT ... INTO OUTFILE
).
See section LOAD DATA
.