(mysql.info.gz) NULL values

Info Catalog

(mysql.info.gz) Boolean values

(mysql.info.gz) Literals

 
 9.1.5 `NULL' Values
 -------------------
 
 The `NULL' value means "no data."  `NULL' can be written in any
 lettercase.
 
 Be aware that the `NULL' value is different from values such as `0' for
 numeric types or the empty string for string types.   Problems
 with `NULL' Problems with NULL.
 
 For text file import or export operations performed with `LOAD DATA
 INFILE' or `SELECT ... INTO OUTFILE', `NULL' is represented by the `\N'
 sequence.   `LOAD DATA' LOAD DATA.
 

Info Catalog

(mysql.info.gz) Boolean values

(mysql.info.gz) Literals