2019年6月10日 · I have a problem with my query. I have to do left outer join only if condition is true. If condition is false do another left outer join. I tried with this but not successfully: select * fr...

An SQL JOIN clause is used to combine rows from two or more tables, based on a common field between them. There are different types of joins available in SQL: INNER JOIN: returns rows …

2009年1月2日 · Explains the difference between LEFT JOIN and LEFT OUTER JOIN in SQL Server.

For this problem, as for many others involving non-trivial left joins such as left-joining on inner-joined tables, I find it convenient and somewhat more readable to split the query with a with …

2012年2月21日 · I am working on an SQL statement and just wanted to clarify my understanding of join syntax in MS SQL. Say I have the SQL... select t.year from HOUSE AS h LEFT OUTER …

2012年9月13日 · This is particularly pronounced when a series of other left joined tables follows the one with the "and" condition - you can prevent joins from even happening to the following …

Here LEFT JOIN will work as INNER JOIN because of WHERE condition and subquery. It should be like: SELECT s.*, ss.* FROM student AS s LEFT JOIN student_story AS ss ON …

2013年11月1日 · Bit late to the party, but a join can only use one index. So if you have a join that has multiple conditions seperated with an or, there is only a slim chance to have a meaningful …

A LEFT OUTER JOIN will return all records from the LEFT table joined with the RIGHT table where possible. If there are matches, though, it will still return all rows that match.

2012年10月2日 · You can simply join the table of different database. You need to specify the database name in your FROM clause. To make it shorter, add an ALIAS on it, SELECT a.*, -- …