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SQL Server FAQ - What Is a SELECT Query Statement

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(Continued from previous topic...)

What Is a SELECT Query Statement?

The SELECT statement is also called the query statement. It is the most frequently used SQL statement in any database application. SELECT statements allows you to retrieve data from one or more tables or views, with different selection criteria, grouping criteria and sorting orders.

A SELETE statement has the following basic syntax:

SELECT select_list 
   FROM table_source 
   WHERE search_condition
   GROUP BY group_by_expression 
   HAVING search_condition
   ORDER BY order_by_expression

Here is an example of a SELECT statement with all clauses mentioned above:

SELECT SalesOrderID, SUM(LineTotal) AS TotalPrice
   FROM SalesLT.SalesOrderDetail
   WHERE ModifiedDate > '2004-05-01'
   GROUP BY SalesOrderID
   HAVING COUNT(*) > 30
   ORDER BY TotalPrice DESC

(Continued on next topic...)

1. What Is a SELECT Query Statement?
2. How To Create a Testing Table with Test Data?
3. How To Select All Columns of All Rows from a Table with a SELECT statement?
4. How To Select Some Specific Columns from a Table in a Query?
5. How To Select Some Specific Rows from a Table?
6. How To Add More Data to the Testing Table?
7. How To Sort the Query Output with ORDER BY Clauses?
8. Can the Query Output Be Sorted by Multiple Columns?
9. How To Sort Query Output in Descending Order?
10. How To Count Rows with the COUNT(*) Function?
11. Can SELECT Statements Be Used on Views?
12. How To Filter Out Duplications in the Returning Rows?
13. What Are Group Functions in Query Statements?
14. How To Use Group Functions in the SELECT Clause?
15. Can Group Functions Be Mixed with Non-group Selection Fields?
16. How To Divide Query Output into Multiple Groups with the GROUP BY Clause?
17. How To Apply Filtering Criteria at Group Level with The HAVING Clause?
18. How To Count Duplicated Values in a Column?
19. Can Multiple Columns Be Used in GROUP BY?
20. Can Group Functions Be Used in the ORDER BY Clause?