Delete all data of specified query criteria in Oracle

One 、 Business needs

    The business needs to be able to delete all the contents found according to the query .

Two 、 Thought analysis

    Oracle Can be deleted directly by DELETE Statements delete the contents of specified conditions one by one ; But this way is too troublesome , If there are tens of millions of items , The effect of implementation is not high , It's not elegant either ; Is there any way to delete all the contents queried according to the conditions without writing a cycle ？

just Oracle Of IN Condition It can meet this effect ,IN It can match all the contents that meet the conditions , Equivalent to traversal loop .

3、 ... and 、 Implementation method

3.1、 Delete all the data of the specified query criteria

DELETE  Table name  WHERE  Field name  IN (SELECT  Field name  FROM  Table name  WHERE  Field name + Expression conditions )

3.2、 Implementation steps

① The data in the original table is as follows ：

② For example, delete salary less than 6000 All personnel information under SQL sentence

// Delete salary less than 6000 And the following employee information 

DELETE "EmployeeInfo" WHERE "Salary" IN (SELECT "Salary" FROM "EmployeeInfo" WHERE "Salary"<=6000)

③ Delete salary less than 6000 All personnel information under SQL The personnel information table after the statement is as follows ：