Related Documentation Download this Manual
PDF (US Ltr) - 40.6Mb
PDF (A4) - 40.7Mb
PDF (RPM) - 40.3Mb
HTML Download (TGZ) - 10.7Mb
HTML Download (Zip) - 10.7Mb
HTML Download (RPM) - 9.3Mb
Man Pages (TGZ) - 243.0Kb
Man Pages (Zip) - 348.2Kb
Info (Gzip) - 3.9Mb
Info (Zip) - 3.9Mb
Excerpts from this Manual

MySQL 8.0 Reference Manual  /  ...  /  NULL Values

9.1.7 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. For more information, see Section B.3.4.3, “Problems with NULL Values”.

For text file import or export operations performed with LOAD DATA or SELECT ... INTO OUTFILE, NULL is represented by the \N sequence. See Section 13.2.7, “LOAD DATA Statement”.

For sorting with ORDER BY, NULL values sort before other values for ascending sorts, after other values for descending sorts.