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dev:sql:select [2009/11/30 16:07] tdo |
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| - | <html><div align="center"><span style="color:red">DRAFT</span></div></html> | ||
| - | ====== Omnidex SQL: SELECT ====== | ||
| - | |||
| - | |||
| - | ===== Description ===== | ||
| - | ===== Syntax ===== | ||
| - | |||
| - | SELECT expression_list | ||
| - | FROM data_source | ||
| - | [ WHERE predicates ] | ||
| - | [ GROUP BY expression_list ] | ||
| - | [ HAVING predicates ] | ||
| - | [ ORDER BY expression_list ] | ||
| - | [ ON [ CURSOR ] cursor_no ] | [ INSTANCE instance_no ] | ||
| - | [ WITH options ] | ||
| - | |||
| - | expression_list | ||
| - | [ DISTINCT column | TOP n | EVERY n | RANDOM n] | ||
| - | [ UNION [ALL] | INTERSECT | EXCEPT ] | ||
| - | [ * ] | [ table.]column [column_alias] [, table.column ... ] | ||
| - | [ (subquery) ] | ||
| - | [ aggregate_function( [table.]column ) | ||
| - | |||
| - | FROM table1 [ table_alias ] [, table2 [ table_alias ] [ $omnidex ] ] | ||
| - | [ LFET | RIGHT ] | ||
| - | [ OUTER ] | ||
| - | [ JOIN ] | ||
| - | [ , table2 ] | ||
| - | [ ON table1.linkfield = table2.linkfield ] | ||
| - | |||
| - | WHERE | ||
| - | [ EXISTS (subquery) ] | ||
| - | [ IN (subquery) ] | ||
| - | |||
| - | GROUP BY | ||
| - | |||
| - | HAVING [ left_operand operator subquery ] | ||
| - | [ left_operaand IN (subquery) ] | ||
| - | |||
| - | ORDER BY [column | position ] [, column | position ] | ||
| - | |||
| - | ===== Discussion ===== | ||
| - | |||
| - | == FROM data_source == | ||
| - | == WHERE Clause == | ||
| - | == GROUP BY Clause == | ||
| - | == HAVING Clause == | ||
| - | == ORDER BY Clause == | ||
| - | == WITH options == | ||
| - | |||
| - | ===== Examples ===== | ||
| - | |||
| - | ==== Simple ==== | ||
| - | |||
| - | > select * from mytable | ||
| - | |||
| - | ==== select columns ==== | ||
| - | |||
| - | > select company, contact from mytable | ||
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