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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===
:{   *   |   ''table_alias''.*   |   ''column_name'' [ [AS] ''alias'' ]   |   [[#expr|expr]] [AS] ''alias'' }   
:{ * | ''table_alias''.* | ''column_name'' [ [AS] ''alias'' ] | [[#expr|expr]] [AS] ''alias'' }   


where:
where:

Revision as of 23:44, 14 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 or join 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.
For example: DISTINCT(customer_name,address)

Learn more:: MySQL Select Statement syntax

column_expr

{ * | table_alias.* | column_name [ [AS] alias ] | expr [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

expr

{
SQL Function
   | stuff...
}

table_reference

where_clause

group_by_clause

order_by_clause

limit_clause

{ maximum_rows | offset, maximum_rows }

where:

maximum_rows
Maximum number of rows to return.
offset
The row to start from. Offset for the first row is zero (0).