Difference between revisions of "SQL Syntax"
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There are several ways to specify columns: | There are several ways to specify columns: | ||
:{ ''column_name'' | | :{ ''column_name'' | [[SQL Functions|SQL Function]] } | ||
:: [ [AS] ''alias''] | |||
where: | where: | ||
:;''alias'': Displayed as the column name in the set | :;''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]]. | ||
::For example: | |||
:::<syntaxhighlight lang="sql" enclose="div"> | |||
SELECT CONCAT(last_name,', ',first_name) AS full_name | |||
FROM Customer_Contacts ORDER BY full_name; | |||
</syntaxhighlight> | |||
===group_expr=== | ===group_expr=== | ||
===order_expr=== | ===order_expr=== |
Revision as of 20:03, 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:
- 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_expr or order_expr.
- For example:
- <syntaxhighlight lang="sql" enclose="div">
SELECT CONCAT(last_name,', ',first_name) AS full_name
FROM Customer_Contacts ORDER BY full_name;
</syntaxhighlight>