The SELECT reserved word is part of the Data Manipulation Language (DML) defined by Codd and is used to query data from the database. Because of its popularity, there are many clauses and functions that can be used to construct a query to retrieve data. Today, I am continuing our exploration of this reserved word by reviewing queries that merge data using the APPLY operator. The APPLY operator come in two flavors: CROSS and OUTER. I am going to concentrate on the later during this discussion. I will be using…
Tag: LEFT JOIN
Selecting Data – Part 2
The SELECT reserved word is part of the Data Manipulation Language (DML) defined by Codd and is used to query data from the database. Because of its popularity, there are many clauses and functions that can be used to construct a query to retrieve data. Today, I am continuing our exploration of this reserved word by reviewing queries that merge data using joins and unions. Six known join types exist in SQL Server. The definitions are based upon joining TABLE A (left) with TABLE B (right). Inner Join – Include…