SQL Joins

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SQL joins are used to combine rows from two or more tables. SQL JOIN An SQL JOIN clause is used to combine rows from two or more tables, based on a common field between them. The most common type of join is: SQL INNER JOIN (simple join). An SQL INNER…

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SQL Aliases

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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 SQL Alias…

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SQL BETWEEN Operator

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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 Demo Database In this tutorial we will use the well-known Northwind sample database. Below is a…

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SQL IN Operator

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The IN Operator The IN operator allows you to specify multiple values in a WHERE clause. SQL IN Syntax Demo Database In this tutorial we will use the well-known Northwind sample database. Below is a selection from the “Customers” table: CustomerID CustomerName ContactName Address City PostalCode Country 1 Alfreds Futterkiste…

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SQL Wildcards

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A wildcard character can be used to substitute for any other character(s) in a string. SQL Wildcard Characters In SQL, wildcard characters are used with the SQL LIKE operator. SQL wildcards are used to search for data within a table. With SQL, the wildcards are: Wildcard Description % A substitute…

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