One reason to use this instead of the join is that a DELETE with JOIN forbids the use of LIMIT. If you wish to delete in blocks so as not to produce full table locks, you can add LIMIT use this DELETE WHERE EXISTS method. Whilst all the given here provide alternative means of solving the specific example given in the question, they all do so without actually including a left outer join explicitly in the delete statement. For example, to delete rows that exist in tthat have no match in t use a LEFT JOIN : DELETE tFROM tLEFT JOIN tON t1.
In standard SQL, they are not equivalent. Unlike the inner join , left join , and right join , the cross join clause does not have a join condition. The cross join combines each row from the first table with every row from the right table to make the result set. INNER JOIN is used with an ON clause, CROSS JOIN is used otherwise. How to delete all tables in MySQL?
What is drop table in MySQL? In general, parentheses can be ignored in join expressions containing only inner join operations. The right join makes a Cartesian product of rows from the joined tables. SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL An Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL.