About Trusted Foreign Key Contraints
I will post some of my findings about trusted foreign keys and constants here since this has become a minor issue at work.…
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Database Availability State Statuses
The possible values in the State and State_Desc columns of sys.databases are: 0 = ONLINE 1 = RESTORING 2 = RECOVERING 3 =…
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T-SQL Querying and Query Processing Order
The order in which we write T-SQL queries happen in this order:
|
1 2 3 4 5 6 |
SELECT FROM WHERE GROUP BY HAVING ORDER BY |
however, the order the Query Processor on SQL Server processes…
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SQL Server coding and naming conventions and best practices and guidelines
Here is a good blog post on SQL Server coding and naming conventions: Database coding conventions, best practices, programming guidelines Views – 3024
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Using EXISTS for Functions, Stored Procedures and Databases
Here is a segment of code you should add to any T-SQL that is dropping a function or stored procedure to make sure…
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A Simple Overview of a SQL Query
Here are the 4 basic steps all queries go through: 1. Parsing: The query is examined by SQL Server to syntax errors, invalid…
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Execution Plan Notes
Clustered Index Seek: performed where there is a WHERE clause and the search parameter is included in the clustered index. Clustered Index Scan:…
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SQL Server 2012 DMV’s (Dynamic Management Views)
Notes about DMV’s in General DMV data is discarded when the SQL Server service is restarted as it is stored in memory and…
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SQL Server 2012 Internals
Life Cycle of a Query The command parser evaluates the query and generates a hash to see if the buffer pool has an…
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