MySQL - clear data in the table

mysql – Empty table data

There are two ways to delete table information :

truncate table table_name;
delete * from table_name;

Copy

notes : truncate In operation table It can be omitted ,delete In operation * It can be omitted

• truncate、delete The difference between clearing table data :

1> truncate Delete as a whole ( Faster ),delete Delete... Item by item ( Slower ) 2> truncate Do not write to the server log,delete Write server log, That is to say truncate Efficient than delete The reason for high 3> truncate Do not activate trigger ( trigger ), But it will reset Identity ( Identity column 、 Self increasing field ), It is equivalent to that the auto increment column will be set to the initial value , Again from 1 Start recording , Instead of following the original ID Count . and delete After deletion ,identity It is still the latest record that was deleted ID Add 1 Record after . If you only need to delete some records in the table , Only use DELETE Sentence match where Conditions

Publisher ： Full stack programmer stack length , Reprint please indicate the source ：https://javaforall.cn/101829.html Link to the original text ：https://javaforall.cn