Syntax alias problem based on delete in mysql

MySQL delete syntax alias problem

First, confirm that the delete statement in MySQL supports aliases;

When writing the delete syntax yourself, the statement is as follows:

delete from tableA a where a.c_pk_id = '123'

However, an alias usage error will be reported, as follows:

[Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'q
WHERE
q.C_PLY_NO = '1100107000404000220150000001'
AND q.N_EDR_PRJ_NO = '1' at line 3

Through the query data, I learned that the syntax of MySQL delete is somewhat special, as follows:

delete a from tableA a where a.c_pk_id = '123'

Deleted successfully! ! !

After comparison, we can know that when using an alias in a delete statement, you need to write an additional alias after delete.

Using alias in mysql delete statement

grammar:

delete <alias> from <table> <alias> where <alias>.<field>...

The alias must appear once after the delete.

Deletion syntax between multiple tables:

DELETE t1, t2 FROM t1 INNER JOIN t2 INNER JOIN t3
WHERE t1.id=t2.id AND t2.id=t3.id;

Or:

DELETE FROM t1, t2 USING t1 INNER JOIN t2 INNER JOIN t3
WHERE t1.id=t2.id AND t2.id=t3.id;

LEFT JOIN:

DELETE t1 FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.id IS NULL;

The above is my personal experience. I hope it can give you a reference. I also hope that you will support 123WORDPRESS.COM.