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] '' | : * | ''table_alias''.* | ''column_name'' [ [AS] ''column_alias'' ] | [[#expr|expr]] [AS] ''column_alias'' | ||
where: | where: | ||
:;'' | :;''column_alias'': Displays as the column name in the result set, in the [[SQL Browser]].<br>Can 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> |
Revision as of 00:17, 15 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] column_alias ] | expr [AS] column_alias
where:
- column_alias
- Displays 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;
- SELECT CONCAT(last_name,', ',first_name) AS full_name
expr
- | stuff...
table_reference
where_clause
group_by_clause
order_by_clause
- ORDER BY column_name [ASC | DESC] [, column_name [ASC | DESC] ...]
where:
- ASC
- Ascending (the default).
- DESC
- Descending.
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).