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Monday, November 17, 2014

Guidlines to write a SELECT statement



Basic SELECT statement:

SELECT *|{[DISTINCT] column|expression [alias],...}
FROM    table;

SELECT identifies the columns to be displayed
FROM identifies the table containing those columns

Writing SQL Statements:
       SQL statements are not case-sensitive.
       SQL statements can be on one or more lines.
       Keywords cannot be abbreviated or split
across lines.
       Clauses are usually placed on separate lines.
       Indents are used to enhance readability.
       In iSQL*Plus, SQL statements can optionally be terminated by a semicolon (;). Semicolons are required if you execute multiple SQL statements.
       In SQL*plus, you are required to end each SQL statement with a semicolon (;).

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