To delete all rows containing string “foo” in table “bar”, you need to use LIKE operator.
To understand the above syntax, let us create a sample table with name “bar”. The query to create a table is as follows. We will always insert records with string “foo” using INSERT command after creating the below table −
mysql> create table bar -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Words longtext, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.61 sec)
Now you can insert some records in the table using insert command. The string “foo” is also added while inserting records. The query is as follows −
mysql> insert into bar(Words) values('Javafoo'); Query OK, 1 row affected (0.14 sec) mysql> insert into bar(Words) values('fooMySQL'); Query OK, 1 row affected (0.19 sec) mysql> insert into bar(Words) values('Introductiontofoo C and C++'); Query OK, 1 row affected (0.22 sec) mysql> insert into bar(Words) values('Introduction to Node.js'); Query OK, 1 row affected (0.19 sec) mysql> insert into bar(Words) values('Introduction to Hibernate framework'); Query OK, 1 row affected (0.17 sec)
Here is the query to display all records from the table using select statement. The query is as follows −
mysql> select *from bar;
The following is the output −
+----+-------------------------------------+ | Id | Words | +----+-------------------------------------+ | 1 | Javafoo | | 2 | fooMySQL | | 3 | Introductiontofoo C and C++ | | 4 | Introduction to Node.js | | 5 | Introduction to Hibernate framework | +----+-------------------------------------+ 5 rows in set (0.00 sec)
Here is the query to delete all rows containing string “foo” from table “bar” −
mysql> delete from bar where Words like '%foo' -> or Words like '%foo%' -> or Words like 'foo%'; Query OK, 3 rows affected (0.20 sec)
Now check the table record once again. The query is as follows −
mysql> select *from bar;
The following is the output −
+----+-------------------------------------+ | Id | Words | +----+-------------------------------------+ | 4 | Introduction to Node.js | | 5 | Introduction to Hibernate framework | +----+-------------------------------------+ 2 rows in set (0.00 sec)
Now look at the above sample output, all the records containing string “foo” have been deleted from table “bar”.