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Difference between revisions of "SQL Syntax"

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There are several ways to specify columns:
There are several ways to specify columns:


:{ ''column_name'' | ''column_name'' AS ''alias'' | ''column_name'' ''alias'' }
:{ ''column_name'' | [[SQL Functions|SQL Function]] }
:: [ [AS] ''alias'']


where:
where:
:;''alias'': Displayed as the column name in the set of results, in the [[SQL Browser]]. Can also be used as a field name in a [[#group_expr|group_expr]] or [[#order_expr|order_expr]].
:;''alias'': Displayed as the column name in the result set, in the [[SQL Browser]]. Can also be used as a field name in a [[#group_expr|group_expr]] or [[#order_expr|order_expr]].
::For example:
:::<syntaxhighlight lang="sql" enclose="div">
SELECT CONCAT(last_name,', ',first_name) AS full_name
  FROM Customer_Contacts ORDER BY full_name;
</syntaxhighlight>


===group_expr===
===group_expr===


===order_expr===
===order_expr===

Revision as of 20:03, 11 November 2011

Here is the syntax for the SQL SELECT statements that the SQL parser recognizes.

Considerations
  • SQL syntax is case insensitive.
  • Field and table names are case sensitive

Learn more:: SQL Functions

Legend
  • [ ... ] - Optional (one or none)
  • [ ... ]* - Zero or more
  • { ... | ... } - Choose one

SELECT STATEMENT

In a select statement, you designate one more columns, separated by commas (or "*" for all columns), a table to get the data from, and additional options:

SELECT
[ DISTINCT ]
{ * | column_expr [, column_expr]* }
FROM table_reference
[WHERE where_clause]
[GROUP BY group_clause]
[ORDER BY order_clause]
[LIMIT limit_clause]

where:

DISTINCT
Eliminates duplicate rows from the result set.
Note:
For example: DISTINCT(customer_name,address)

Learn more:: MySQL Select Statement syntax

column_expr

There are several ways to specify columns:

{ column_name | SQL Function }
[ [AS] alias]

where:

alias
Displayed as the column name in the result set, in the SQL Browser. Can also be used as a field name in a group_expr or order_expr.
For example:
<syntaxhighlight lang="sql" enclose="div">

SELECT CONCAT(last_name,', ',first_name) AS full_name

 FROM Customer_Contacts ORDER BY full_name;

</syntaxhighlight>

group_expr

order_expr