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'' } | ||
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;
- SELECT CONCAT(last_name,', ',first_name) AS full_name
Learn more:: SQL Functions
expr
- {
- | 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).