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| - | <html><div align="center"><span style="color:red">DRAFT</span></div></html> | ||
| - | ====== Omnidex SQL Statement: SELECT ====== | ||
| - | {{page>:sql_bar&nofooter&noeditbtn}} | ||
| - | ===== Description ===== | ||
| - | The Omnidex SQL Select statement is the primary statement used to query records on Omnidex enhanced data. | ||
| - | Omnidex will automatically optimize the SELECT statement using Omnidex indexes. | ||
| - | ===== Syntax ===== | ||
| - | The concise syntax for the Omnidex SELECT statement is the following: | ||
| - | |||
| - | <code> | ||
| - | SELECT expression_list | ||
| - | FROM data_source | ||
| - | [ WHERE clause ] | ||
| - | [ GROUP BY expression_list ] | ||
| - | [ HAVING predicates ] | ||
| - | [ ORDER BY expression_list ] | ||
| - | [ ON [ CURSOR ] cursor_no ] | [ INSTANCE instance_no ] | ||
| - | [ WITH options ] | ||
| - | </code> | ||
| - | |||
| - | ==== Expression_list syntax: ==== | ||
| - | <code> | ||
| - | expression_list | ||
| - | [ < TOP (n) | ||
| - | [ SKIP(n) | EVERY(n) | RANDOM (n [, seed] ) ] ] | ||
| - | [ < DISTINCT column | ALL >] | ||
| - | [ SAMPLE(‘control_break’ [, ’qualifier’]) ] | ||
| - | [ UNION [ALL] | INTERSECT | EXCEPT ] | ||
| - | [ * ] | [ table.]column [column_alias] [, table.column ... ] | ||
| - | [ (subquery) ] | ||
| - | [ aggregate_function( [table.]column ) ] | ||
| - | [ $uniquekey | $odxid ] | ||
| - | |||
| - | </code> | ||
| - | |||
| - | ==== FROM Clause syntax: ==== | ||
| - | <code> | ||
| - | FROM [database.]table1 [ table_alias ] [, [database.]table2 [ table_alias ] [ $omnidex ] ] | ||
| - | [[ < LEFT | RIGHT >][ OUTER ] ] | ||
| - | [ JOIN [database.]table2 ] | ||
| - | [ ON table1.linkfield = table2.linkfield ] | ||
| - | [ <AND| OR> NOT] [database.]tableN.linkfield = [database.]tableN.linkfield ] | ||
| - | </code> | ||
| - | ==== WHERE Clause Syntax: ==== | ||
| - | <code> | ||
| - | WHERE [ criteria_list ] | ||
| - | [ EXISTS (subquery) ] | ||
| - | [ IN (subquery) ] | ||
| - | </code> | ||
| - | |||
| - | ==== GROUP BY Clause Syntax: ==== | ||
| - | <code> | ||
| - | GROUP BY group_by_columns | ||
| - | HAVING [ left_operand operator subquery ] | ||
| - | [ left_operand IN (subquery) ] | ||
| - | </code> | ||
| - | ==== ORDER BY Clause Syntax: ==== | ||
| - | <code> | ||
| - | ORDER BY [column | column_position ] [, column | column_position ] | ||
| - | </code> | ||
| - | |||
| - | ==== WITH Clause Syntax: ==== | ||
| - | <code> | ||
| - | WITH options | ||
| - | </code> | ||
| - | |||
| - | ===== Discussion ===== | ||
| - | ==== Expression_list ==== | ||
| - | The expression_list can be one of the following: | ||
| - | |||
| - | | * | All columns for the named tables using a syntax of [/[ database. ] table. ]] * | | ||
| - | | column | A column, optionally qualified by a table, optionally with an alias using a syntax of [/[database.]table.]column [/[AS] column_alias]] | | ||
| - | | (subquery) | A nested subquery that returns a single select item. | | ||
| - | | expression | A standard SQL or Omnidex-specific function | | ||
| - | |||
| - | ==== table_list table_spec [join_syntax ] ==== | ||
| - | | ||
| - | One of the following: | ||
| - | | table | A table using a syntax of[database.]table. | | ||
| - | | $OMNIDEX | A dummy table consisting of one row and one column. | | ||
| - | | (subquery) | A nested subquery. | | ||
| - | ==== FROM Clause ==== | ||
| - | |||
| - | ==== WHERE Clause ==== | ||
| - | ==== GROUP BY Clause ==== | ||
| - | ==== HAVING Clause ==== | ||
| - | ==== ORDER BY Clause ==== | ||
| - | |||
| - | Order by column is in the format of [database.][table.]column or table_alias.column. | ||
| - | |||
| - | Column can also be an alias name of the column. | ||
| - | |||
| - | ==== WITH options ==== | ||
| - | |||
| - | === PRESERVE_CRITERIA === | ||
| - | |||
| - | === PRESERVE_CRITERIA_ORDER === | ||
| - | |||
| - | ===== Examples ===== | ||
| - | ==== Select all columns from table ==== | ||
| - | |||
| - | > select * from mytable | ||
| - | ==== Select with Omnidex criteria on Quicktext column ==== | ||
| - | |||
| - | > select company, contact from mytable where company = 'Information'; | ||
| - | |||
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