Difference between revisions of "SQL Syntax"

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''Learn more:'': [http://dev.mysql.com/doc/refman/5.5/en/select.html MySQL Select Statement syntax]
''Learn more:'': [http://dev.mysql.com/doc/refman/5.5/en/select.html MySQL Select Statement syntax]
===column_expr===
===column_expr===
:{ ''column_name'' | [[SQL Functions|SQL Function]] }  [ [AS] ''alias'']
:{ ''column_name'' [ [AS] ''alias'']
:| [[SQL Functions|SQL Function]] AS ''alias''  
:} 


where:
where:

Revision as of 01:44, 12 November 2011

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

Considerations
  • SQL syntax is case insensitive.
  • Field and table names are case sensitive
Legend
  • [ x ] - Optional (one or none)
  • [, x ... ] - Optional additional values, in a comma-separated list
  • x | y - Choose one. Curly braces are added when needed: { x | y } ...
  • CAPITALIZED - SQL Keyword (case insensitive)
  • italicized - Value you supply. (Table names and column names are case-sensitive)

SELECT Statement

In a select statement, you designate one more columns, separated by commas (or "*" for all columns), plus 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_by_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

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

where:

alias
Displayed as the column name in the result set, in the SQL Browser.
Can 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;

Learn more:: SQL Functions

table_reference

where_clause

group_by_clause

order_by_clause

limit_clause