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SQL SERVER – @@IDENTITY vs SCOPE_IDENTITY() vs IDENT_CURRENT – Retrieve Last Inserted Identity of Record

March 25, 2007

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

SELECT @@IDENTITY It returns the last IDENTITY value produced on a connection, regardless of the table that produced the value, and regardless of the scope of the statement that produced the value. @@IDENTITY will return the last identity value entered into a table in your current session. While @@IDENTITY is…

SQL SERVER – SQL Commandments – Suggestions, Tips, Tricks

March 20, 2007

Pinal Dave

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

Best Practices, Database, Software Development, SQL Backup and Restore, SQL Constraint and Keys, SQL DateTime, SQL Download, SQL Error Messages, SQL Function, SQL Index, SQL Joins, SQL Server DBCC, SQL Server Security, SQL Stored Procedure

Few days ago, while searching for something on web site, I came across a very good article of 25 SQL Commandments. I really enjoyed reading it. It was for Oracle, I re-wrote it for SQL Server. First 18 points are taken from original article and last 2 I added to…

SQL SERVER – DBCC command to RESEED Table Identity Value – Reset Table Identity

March 15, 2007

Pinal Dave

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

SQL Index, SQL Scripts, SQL Server DBCC, SQL Server Security

DBCC CHECKIDENT can reseed (reset) the identity value of the table. For example, YourTable has 25 rows with 25 as last identity. If we want next record to have identity as 35 we need to run following T SQL script in Query Analyzer. DBCC CHECKIDENT (yourtable, reseed, 34) If table…

SQL SERVER – Primary Key Constraints and Unique Key Constraints

February 5, 2007

Pinal Dave

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

Database, Software Development, SQL Coding Standards, SQL Constraint and Keys, SQL Download, SQL Error Messages, SQL Index, SQL Joins, SQL Scripts, SQL Server Security

Primary Key: Primary Key enforces uniqueness of the column on which they are defined. Primary Key creates a clustered index on the column. Primary Key does not allow Nulls. Create table with Primary Key: CREATE TABLE Authors ( AuthorID INT NOT NULL PRIMARY KEY, Name VARCHAR(100) NOT NULL ) GO…

SQL SERVER – ReIndexing Database Tables and Update Statistics on Tables

January 31, 2007

Pinal Dave

SQL Performance

Best Practices, SQL Constraint and Keys, SQL Cursor, SQL Index, SQL Joins, SQL Scripts, SQL Server DBCC, SQL Stored Procedure

SQL SERVER 2005 uses ALTER INDEX syntax to reindex database. SQL SERVER 2005 supports DBREINDEX but it will be deprecated in future versions. Let us learn how to do ReIndexing Database Tables and Update Statistics on Tables.