By tag: Join
0
kicks
SQL Join Resources
A Join combines records from two (or more) tables to create a new data set. There are several ways to join SQL tables.
0
kicks
Why to avoid FULL OUTER JOINS -- and what to use instead
Using FULL OUTER JOINS results in sloppy, inefficient SQL, with no true structure and NULLS in potentially every column in the results. Here's some better ways to write your SELECT if you think you might need to use a FULL OUTER JOIN.
0
kicks
SQL Server: JOIN vs IN vs EXISTS - the logical difference
There is a common misconception that IN behaves equaliy to EXISTS or JOIN in terms of returned results.
This is simply not true.
See why not and how to avoid the confusion.
0
kicks
You Should Never Use IN In SQL To JOIN With Another Table
Do you use the following syntax?
SELECT *
FROM TABLE
WHERE CoLumn IN (SELECT CoLumn FROM TABLE)
Do NOT use that it can cause big problems if you do not understand exactly how IN and NOT IN works
0
kicks
Query and join tables across db server instances
Sometimes you need to query across servers, even servers of different type such as doing a table join from MySQL to Oracle. I’m going to show you two ways you could do this if you have access to an SQL Server. There are ways to do this with other servers, and there are more than two ways to do this ...