Biggest Table in a DB

CREATE TABLE #temp (
table_name sysname ,
row_count INT,
reserved_size VARCHAR(50),
data_size VARCHAR(50),
index_size VARCHAR(50),
unused_size VARCHAR(50))
SET NOCOUNT ON
INSERT #temp
EXEC sp_msforeachtable 'sp_spaceused ''?'''
SELECT a.table_name,
a.row_count,
COUNT(*) AS col_count,
a.data_size
FROM #temp a
INNER JOIN information_schema.columns b
ON a.table_name collate database_default
= b.table_name collate database_default
GROUP BY a.table_name, a.row_count, a.data_size
ORDER BY CAST(REPLACE(a.data_size, ' KB', '') AS integer) DESC
DROP TABLE #temp

Simple Cursor

This is the simplest example of the SQL Server Cursor. I have used this all the time for any use of Cursor in my T-SQL.
DECLARE @AccountID INT
DECLARE @getAccountID CURSOR
SET @getAccountID = CURSOR FOR
SELECT Account_ID
FROM Accounts
OPEN @getAccountID
FETCH NEXT
FROM @getAccountID INTO @AccountID
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT @AccountID
FETCH NEXT
FROM @getAccountID INTO @AccountID
END
CLOSE @getAccountID
DEALLOCATE @getAccountID

SQL: Not In

EXCEPT or NOT EXIST clause can be used in place of LEFT JOIN or NOT IN for better peformance.
Example:
SELECT EmpNo, EmpName
FROM EmployeeRecord
WHERE Salary > 1000 AND Salary
NOT IN (SELECT Salary
FROM EmployeeRecord
WHERE Salary > 2000);

(Recomended)
SELECT EmpNo, EmpName
FROM EmployeeRecord
WHERE Salery > 1000
EXCEPT
SELECT EmpNo, EmpName
FROM EmployeeRecord
WHERE Salery > 2000
ORDER BY EmpName;

SQL Guidlines

http://blog.sqlauthority.com/2008/09/25/sql-server-guidelines-and-coding-standards/

SP faster

Use SET NOCOUNT ON at the beginning of SQL Batches, Stored Procedures and Triggers. This improves the performance of Stored Procedure.