Created by Felipe Farías
over 8 years ago
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Projection: Select the columns in a table that a returned by a query Selection: Select the rows in a table that are returned by a query Join: Bring together data that is stored in different tables by specifying the link between them.
clause: is a part of SQL Statement - for example select * statement: is a combination of two or more clauses - for example select * from employees
Writing SQL Statements• SQL statements are not case sensitive (unless indicated).• SQL statements can be entered on one or many lines.• Keywords cannot be split across lines or abbreviated.• Clauses are usually placed on separate lines for readability and ease of editing.• Indents should be used to make code more readable.• Keywords typically are entered in uppercase; all other words, such as table names and columnsnames are entered in lowercase.
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