Difference between revisions of "SQL Syntax"

From LongJump Support Wiki
imported>Aeric
imported>Aeric
Line 20: Line 20:
::FROM [[#table_reference|table_reference]]
::FROM [[#table_reference|table_reference]]
:::[WHERE where_clause]
:::[WHERE where_clause]
:::[GROUP BY group_clause]
:::[GROUP BY group_by_clause]
:::[ORDER BY order_clause]
:::[ORDER BY order_clause]
:::[LIMIT limit_clause]
:::[LIMIT limit_by_clause]


where:
where:
Line 37: Line 37:


where:
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|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_by_clause|group_by_clause]] or [[#order_by_clause|order_by_clause]].
::For example:  
::For example:  
:::<tt>SELECT CONCAT(last_name,', ',first_name) AS full_name</tt>
:::<tt>SELECT CONCAT(last_name,', ',first_name) AS full_name</tt>
:::: <tt>FROM Customer_Contacts ORDER BY full_name;</tt>
:::: <tt>FROM Customer_Contacts ORDER BY full_name;</tt>


===group_expr===
===group_by_clause===


===order_expr===
===order_by_clause===

Revision as of 20:06, 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_by_clause]
[ORDER BY order_clause]
[LIMIT limit_by_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_by_clause or order_by_clause.
For example:
SELECT CONCAT(last_name,', ',first_name) AS full_name
FROM Customer_Contacts ORDER BY full_name;

group_by_clause

order_by_clause