Join | search
Click here to view Join news from 60+ newspapers.
Bookmark or Share- SQL JOIN where to place the WHERE condition? - Stack Overflow1. For INNER JOIN any condition can be in a WHERE instead of an ON as long as there is no intervening OUTER JOIN. 2. When moving a LEFT JOIN condition from an ON to a WHERE the performance is irrelevant since (as you say) in general the result differs. 3. That difference does not in general "transform the OUTER JOIN into an INNER JOIN". –
- sql - Using AND in an INNER JOIN - Stack OverflowSELECT * FROM Table A A1 INNER JOIN TABLE B B1 ON B1.ID = A1.ID AND A1.SomeColumn = 'TASK'; And is the same as this. SELECT * FROM Table A A1 INNER JOIN TABLE B B1 ON B1.ID = A1.ID WHERE A1.SomeCoumn = 'TASK'; Whenever you join to a constant it is pretty much the same as adding an additional criterion to the where clause.
- Can I use CASE statement in a JOIN condition? - Stack OverflowA CASE expression returns a value from the THEN portion of the clause. You could use it thusly: SELECT * FROM sys.indexes i JOIN sys.partitions p ON i.index_id = p.index_id JOIN sys.allocation_units a ON CASE WHEN a.type IN (1, 3) AND a.container_id = p.hobt_id THEN 1 WHEN a.type IN (2) AND a.container_id = p.partition_id THEN 1 ELSE 0 END = 1
- SQL JOIN: what is the difference between WHERE clause and ON clause?The SQL JOIN clause allows you to associate rows that belong to different tables. For instance, a CROSS JOIN will create a Cartesian Product containing all possible combinations of rows between the two joining tables. While the CROSS JOIN is useful in certain scenarios, most of the time, you want to join tables based on a specific condition.
- sql - JOIN two SELECT statement results - Stack OverflowCurrently achieving this using the two select statement method with a LEFT JOIN (as opposed to the suggested INNER JOIN, which works but doesn't show persons with no late tasks because they don't exist in the second SELECT Also achieving this with the late column being SUM(CASE WHEN Age > Palt THEN 1 ELSE 0 END) Late –
More
