Month: January 2014

The SQL UNION operator combines the result of two or more SELECT statements. The SQL UNION Operator The UNION operator is used to combine the result-set of two or more SELECT statements. Notice that each SELECT statement within the UNION must have the same number of columns. The columns must also have similar data types. Also, the columns in each SELECT statement must be in the same order. SQL UNION Syntax SELECT column_name(s) FROM table1 UNION SELECT column_name(s) FROM table2; Note: The UNION operator selects only…

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SQL aliases are used to temporarily rename a table or a column heading. SQL Aliases SQL aliases are used to give a database table, or a column in a table, a temporary name. Basically aliases are created to make column names more readable. SQL Alias Syntax for Columns SELECT column_name AS alias_name FROM table_name; SQL Alias Syntax for Tables SELECT column_name(s) FROM table_name AS alias_name; Example SELECT CustomerName AS Customer, ContactName AS FROM Customers; or SELECT CustomerName, Address+’, ‘+City+’, ‘+PostalCode+’, ‘+Country AS Address FROM Customers;…

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The BETWEEN operator is used to select values within a range. The SQL BETWEEN Operator The BETWEEN operator selects values within a range. The values can be numbers, text, or dates. SQL BETWEEN Syntax SELECT column_name(s) FROM table_name WHERE column_name BETWEEN value1 AND value2; Example SELECT * FROM Products WHERE Price BETWEEN 10 AND 20;  

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The LIKE operator is used in a WHERE clause to search for a specified pattern in a column. The SQL LIKE Operator The LIKE operator is used to search for a specified pattern in a column. SQL LIKE Syntax SELECT column_name(s) FROM table_name WHERE column_name LIKE pattern; SQL LIKE Operator Examples The following SQL statement selects all customers with a City starting with the letter “s”: Example SELECT * FROM Customers WHERE City LIKE ‘s%’; or SELECT * FROM Customers WHERE Country LIKE ‘%land%’;

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