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Perform MySQL delete under safe mode?
To delete under safe mode, you can use the below query −
SET SQL_SAFE_UPDATES = 0;
To understand the above query, let us create a table. The following is the query to create a table −
mysql> create table SafeDeleteDemo −> ( −> Price int −> ); Query OK, 0 rows affected (0.50 sec)
Insert some records in the table with the help of insert command. The query is as follows −
mysql> insert into SafeDeleteDemo values(100); Query OK, 1 row affected (0.11 sec) mysql> insert into SafeDeleteDemo values(200); Query OK, 1 row affected (0.19 sec) mysql> insert into SafeDeleteDemo values(300); Query OK, 1 row affected (0.09 sec) mysql> insert into SafeDeleteDemo values(500); Query OK, 1 row affected (0.14 sec) mysql> insert into SafeDeleteDemo values(1000); Query OK, 1 row affected (0.10 sec) mysql> insert into SafeDeleteDemo values(150); Query OK, 1 row affected (0.11 sec)
Display all records from the table before deleting records. The query is as follows −
mysql> select *from SafeDeleteDemo;
The following is the output −
+-------+ | Price | +-------+ | 100 | | 200 | | 300 | | 500 | | 1000 | | 150 | +-------+ 6 rows in set (0.00 sec)
Now delete under safe mode with the help of SET command. The query is as follows −
mysql> SET SQL_SAFE_UPDATES = 0; Query OK, 0 rows affected (0.00 sec)
Begin with deleting some records the table now. We are in safe mode −
mysql> delete from SafeDeleteDemo where Price >=500; Query OK, 2 rows affected (0.14 sec)
Now you can check how many records are present in the table after deleting records. The query is as follows −
mysql> select *from SafeDeleteDemo;
The following is the output displaying that we have successfully deleted records >= 500 −
+-------+ | Price | +-------+ | 100 | | 200 | | 300 | | 150 | +-------+ 4 rows in set (0.00 sec)
Now you can remove delete under safe mode with the help of the same SET command. The query is as follows −
mysql> SET SQL_SAFE_UPDATES = 1; Query OK, 0 rows affected (0.00 sec)
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