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SQL Deep Dives

SQL INNER JOIN: A Complete Guide

The SQL INNER JOIN statement returns rows with exact values in two columns across two tables. You can join a table across one or multiple columns. JOIN statements connect two database tables and compare their contents. There may be times…

SQL Group By: A Complete Guide

The SQL GROUP BY statement appears in aggregate functions. It is used to collate the data you select from a query by a particular column. You can specify multiple columns which will be grouped using the GROUP BY statement. When…

SQL Like: A How-To Guide

The SQL LIKE operator uses wildcards to find data similar to a particular pattern. You can use an underscore to substitute for a single character or a percentage sign to substitute zero, one, or multiple characters. Have you ever wanted…


The SQL ALTER TABLE statement adds, changes, or removes a column in a table. This statement lets you modify a table after it has been created, even if the table stores records. You may decide that you need to make…

How Is SQL’s Not Equal Operator Used?

The SQL not equal operator is represented by <>. This operator lets you select rows from a database that do not meet a particular condition. The != operator is used in a WHERE statement. The != operator can be used…

SQL Add Column: A How-To Guide

There is no SQL ADD COLUMN statement. To add a column to an SQL table, you must use the ALTER TABLE ADD syntax. ALTER TABLE lets you add, delete, or modify columns in a table. After you have created a…

SQL Union

When you’re querying a database, you may want to combine the result of two or more SELECT statements. For example, you may want to get a list of the cities in which your customers are based, and the cities in…

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