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[Source] SQL method of emptying table data

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Posted on 2/9/2015 2:13:22 PM | | |

truncate table tablename
delete from tablename
The biggest problem with the delete method, is when there is a flag field


It is generally recommended to use delete to delete table fields as much as possible, which has the effect of selective deletion, so often delete from tablename where condition
delete and truncate actually have the same function, except that truncate is not followed by a where conditional sentence, its function is to delete all rows (records) in the table
The biggest difference between the two is that delete is written as a log file, while truncate is directly deleted without writing a log, the former can be recovered, while the latter cannot be recovered, the latter is more dangerous, so it is generally not recommended to use truncate, commonly delete




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