There are many types of queries is not the same problem:
1. Check for error conditions
where name = 0; all will find out, when mysql automatically converted, the character can not be converted to digital, or 0
2 index is not workingage <> 12 will be discharged out of the recording NULL
mysql Daily Record
Guess you like
Origin www.cnblogs.com/wayland3/p/11992989.html
Recommended
Ranking