Difference between revisions of "SQL Syntax"
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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: | 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 | :SELECT | ||
::[ DISTINCT ] | |||
::{ * | [[#column_expr|column_expr]] [, [[#column_expr|column_expr]]]* } | ::{ * | [[#column_expr|column_expr]] [, [[#column_expr|column_expr]]]* } | ||
::FROM [[#table_reference|table_reference]] | ::FROM [[#table_reference|table_reference]] | ||
Line 21: | Line 22: | ||
:::[ORDER BY order_clause] | :::[ORDER BY order_clause] | ||
:::[LIMIT limit_clause] | :::[LIMIT limit_clause] | ||
where: | |||
:;DISTINCT:Eliminates duplicate rows from the result set. | |||
::'''Note:''' | |||
:: Parentheses can also be specified around the column expression(s). | |||
:: For example: <tt>DISTINCT(customer_name,address)</tt> | |||
===column_expr=== | ===column_expr=== | ||
There are several ways to specify columns: | There are several ways to specify columns: | ||
:{ | :{ ''column_name'' | ||
:| | :| ''column_name'' AS ''alias'' | ||
: | :| ''column_name'' ''alias'' | ||
:} | :} | ||
where: | where: | ||
:; | :;''alias'': ??? |
Revision as of 19:46, 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:
- Parentheses can also be specified around the column expression(s).
- For example: DISTINCT(customer_name,address)
column_expr
There are several ways to specify columns:
- { column_name
- | column_name AS alias
- | column_name alias
- }
where:
- alias
- ???