SQL: SELECT statement

In a relational database, data is stored in tables. The Select statement allows you to retrieve records from one or more tables in your database. 

The reductive syntax for the Select statement is:

SELECT column_name INTO new_table FROM derived_table WHERE conditions HAVING conditions ORDER BY expression

Example #1

SELECT * FROM EmployeeAddressTable

This example demonstrates a very simple Select query, which uses * to select all of the fields in EmployeeAddressTable.

Example #2

SELECT FirstName FROM EmployeeAddressTable WHERE State = 'Ohio'

By using the Where clause, you can focus your selection by specifying certain criteria to be met by the values. The above example returns the names of all employees who live in state Ohio.

Example #3

SELECT EmployeeStatisticsTable.Salary, EmployeeAddressTable.LastName FROM EmployeeStatisticsTable,EmployeeAddressTable WHERE EmployeeStatisticsTable.EmployeeIDNo = EmployeeAddressTable.EmployeeIDNo

The result set would display the salary and employee name fields where the EmployeeIDNo value existed in both the EmployeeStatisticsTable and EmployeeAddressTable.