Tag Info

New answers tagged


Yes, a prefix length of one will allow you to have a working index for looking up NULLs. Here's the SQLFiddle: http://sqlfiddle.com/#!2/12bf3/1/0 The EXPLAIN says that it is using the desired index. Of course you might want to try a larger test to make sure it performs as well in reality as you hope.


Why don't you do like this : SELECT OCTET_LENGTH(blob_field ) FROM table WHERE predicate ;

Top 50 recent answers are included