This article also provides screenshots of the output console for all queries executed to understand the reader better. We have also learned how to select rows from two or more tabled joints together by joint clause before deleting them. In this article, we have taken two cases of join, i.e., inner and left join. We have learned how to delete records from two or more tables joined by a joint clause. In this article, we have learned about mysql delete join query. Output: After the successful execution of the above query, the output will be displayed on the output console. Output: The output console displays the customer table.Ĭode #3 Delete customer from customer LEFT JOIN contact ON customer.cust_id=nt_id where phone_number is NULL Insert into customer values(1,'sonika','B.com') Insert into customer values(4,'somya','M.B.B.S') Insert into customer values(3,'ashish','B.tech') Insert into customer values(2,'aman','M.tech') Insert into customer values (1,'divya','B.arch') We will create two tables, customer and contact, and insert values into them to explain delete left join:Ĭode #1 create table customer (cust_id int, cust_name varchar(100),qualification varchar(100)) The delete left join table is used to delete rows from the left table that do not have matching records in the right table.īelow is the syntax for deleting rows with a left join that does not have matching rows in another table: Delete table1 from table1 LEFT JOIN table2 ON l_name=lumn2 where l_name is NULL The left join clause is used to select all rows from the left table, even if they have or don’t have matching in the right table. We can also verify our result by using a select query as given below. Insert into contact values (5,'63789292292') ĭelete student,contact from student inner join contact on student.stud_id=l_id where student.stud_id=2 Īfter the successful execution of the above query, the output will be displayed on the output console: Output: Of the student table is displayed in the below output console:Ĭreate table contact (cont_id int, phone_number varchar(150)) Insert into student values (6,'saanvi','italy') Insert into student values(5,'kriti','america') Insert into student values(4,'ashish','india') Insert into student values(3,'rahul','london') Insert into student values(2,'aman','england') Insert into student values (1,'divya','france') create table student(stud_id int, stud_name varchar(150),city varchar(150)) Now we will create another two table student and contact to explain delete inner join:Ĭode #1: The two tables created are student and contact. It indicates that the deletion process has affected two rows. Output: of the above query in the output console: Insert into table2(id,quantity) values('t',105) ĭelete table1,table2 from table1 inner join table2 on table2.quantity=table1.id where table1.id=100 Insert into table2(id,quantity) values('s',104) Insert into table2(id,quantity) values('r',103) Insert into table2(id,quantity) values('q',102) Insert into table2(id,quantity) values('p',101) To explain delete inner join, we have created tables in the database named table1 and table2 and inserted five rows into them.Ĭode #1 – Creating table1 create table table1(id int primary key auto_increment) Ĭode #2 – Creating table2 create table table2(id varchar(100) primary key,quantity int not null) The examples mentioned are as follows: Example #1 Similarly, if we remove table2, the delete statement is only used to table1 and will only delete rows from table1. If we remove table1, the delete statement is only applied to table2 and will only delete rows from table2. Also, the condition followed by the where clause will result in rows in table1 and table2 that need to be deleted. In the above statement, table1.joining_col =table2.joining_col, the expression is the matching condition between table1 and table2 that needs to be deleted. For example, the following statement deletes records from table1 and table2 that satisfy a given condition: Delete table1,table2 from table1 INNER JOIN table2 on table1.joining_col=table2.joining_col where condition In MySQL, we use the inner join clause to delete rows or records that have matching values in the table. Select col_name1,col_l_namen from table1 INNER JOIN table2 ON l_name=l_name
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