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Can we write CASE statement in join condition?
you will get syntax error if you try to execute this in simple tsql. However, Yes you can do it but in dynamic tsql something like this. you will get syntax error if you try to execute this in simple tsql.
How add if condition in join?
A conditional column join is a fancy way to let us join to a single column and to two (or more) columns in a single query. We can accomplish this by using a case statement in the on clause of our join. A case statement allows us to test multiple conditions (like an if/else if/else) to produce a single value.
Can we use if else in query?
In MS SQL, IF…ELSE is a type of Conditional statement. Any T-SQL statement can be executed conditionally using IF… ELSE. If the condition evaluates to True, then T-SQL statements followed by IF condition in SQL server will be executed.
How to use if statement in MySQL join query?
SELECT m.id, u.first_name AS otherUser FROM matches AS m LEFT JOIN users AS u ON u.id = (CASE WHEN u.id=m.user2ID THEN m.user1ID ELSE m.user2ID END) WHERE m.user1ID=2 OR m.user2ID=2 Check this Source. Also check this MYSQL Inner Join if statement .
How to do an if / else in join conditions?
I know how to perform an IF/ELSE in the join conditions, but is there a way I can use a different evaluation of the field altogether based on the ELSE? SELECT o.id, s.id FROM orders o RIGHT JOIN subjects s ON s.name = ‘Blah’ AND s.group_id = IF (o.service = ‘Law Services’, 2, ????)
Can you put a condition in a join clause in SQL?
I’m not certain that this can be done within a single SQL statement. For if you put a condition in the JOIN clause, it will be match for both the TRUE and FALSE condition, depending upon the record being retrieved from the feeding tables and therefore place 2 records into the resultant cursor when both Foreign language and English exist.
When does SQL join with if else result in null?
If the join condition Table_B.language=?m.ForeignLang results in no join you can apply NVL () on the Table_B fields, as all the values will be NULL if no record matches. but the join condition itself will not get NULL, no record fullfilling the condition is found, that doesn’t render the condition itself NULL, not even F.