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dev:sql:statements:select:home [2010/07/02 09:30] tdo |
dev:sql:statements:select:home [2016/06/28 22:38] (current) |
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- | <html><div align="center"><span style="color:red">DRAFT</span></div></html> | ||
- | ====== Omnidex SQL Statement: SELECT ====== | ||
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+ | ====== Omnidex SQL Statement: SELECT ====== | ||
+ | ^See Also:^[[dev:sql:statements:select:from |FROM clause]]^[[dev:sql:statements:select:where | WHERE clause ]]^[[dev:sql:statements:select:group_by | GROUP BY clause]]^[[dev:sql:statements:select:order_by | ORDER BY clause ]]^ | ||
+ | |||
===== Description ===== | ===== Description ===== | ||
The Omnidex SQL Select statement is the primary statement used to query records on Omnidex enhanced data. | The Omnidex SQL Select statement is the primary statement used to query records on Omnidex enhanced data. | ||
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[ < TOP n [ SKIP n ] | EVERY n [ SKIP n ] | RANDOM n | RANDOM (n, seed) > ] | [ < TOP n [ SKIP n ] | EVERY n [ SKIP n ] | RANDOM n | RANDOM (n, seed) > ] | ||
[ SAMPLE(‘control_break’ [, ’qualifier’]) ] | [ SAMPLE(‘control_break’ [, ’qualifier’]) ] | ||
- | [ DISTINCT ] | + | [ < DISTINCT column_spec | ALL >] |
select_list | select_list | ||
FROM data_source | FROM data_source | ||
- | [ WHERE criteria_list ] | + | [ WHERE criteria_specification ] |
- | [ GROUP BY group_by_list ] | + | [ GROUP BY group_by_specification ] |
- | [ HAVING having_list ] | + | [ HAVING having_specification ] |
- | [ ORDER BY order_by_list ] | + | [ ORDER BY order_by_specifcation ] |
[ < UNION [ALL] | INTERSECT | EXCEPT > select_statement ] | [ < UNION [ALL] | INTERSECT | EXCEPT > select_statement ] | ||
[ ON [ CURSOR ] cursor_no ] | [ INSTANCE instance_no ] | [ ON [ CURSOR ] cursor_no ] | [ INSTANCE instance_no ] | ||
[ WITH option_list ] | [ WITH option_list ] | ||
</code> | </code> | ||
+ | |||
==== Select_list syntax: ==== | ==== Select_list syntax: ==== | ||
<code> | <code> | ||
- | [ < TOP (n) | ||
- | [ SKIP(n) | EVERY(n) | RANDOM (n [, seed] ) ] ] | ||
- | [ < DISTINCT column_spec | ALL >] | ||
- | [ SAMPLE(‘control_break’ [, ’qualifier’]) ] | ||
- | [ UNION [ALL] | INTERSECT | EXCEPT ] | ||
[ * ] | [ column_spec [column_alias] [, column_spec ... ] | [ * ] | [ column_spec [column_alias] [, column_spec ... ] | ||
[ (subquery) ] | [ (subquery) ] | ||
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[ column_spec < + | - | / | * > <column_spec | value > [column_alias] ] | [ column_spec < + | - | / | * > <column_spec | value > [column_alias] ] | ||
[ $uniquekey | $odxid ] | [ $uniquekey | $odxid ] | ||
- | |||
</code> | </code> | ||
- | + | ==== FROM datasource: ==== | |
- | ==== FROM Clause Syntax: ==== | + | ^See:^[[dev:sql:statements:select:from | FROM datasource Discussion ]]^ |
<code> | <code> | ||
FROM table_spec [ table_alias ] [, [table_spec2 [ table_alias ] [ $omnidex ] ] | FROM table_spec [ table_alias ] [, [table_spec2 [ table_alias ] [ $omnidex ] ] | ||
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</code> | </code> | ||
- | ==== WHERE Clause Syntax: ==== | + | ==== WHERE criteria_specification Syntax: ==== |
+ | ^See:^[[dev:sql:statements:select:where | WHERE criteria_specification Discussion ]]^ | ||
<code> | <code> | ||
WHERE [ criteria_list ] | WHERE [ criteria_list ] | ||
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[ IN (subquery) ] | [ IN (subquery) ] | ||
</code> | </code> | ||
- | ==== GROUP BY/HAVING Clause Syntax: ==== | + | ==== GROUP BY/HAVING group_by_specification Syntax: ==== |
+ | ^See: ^[[dev:sql:statements:select:group_by | GROUP BY group_by_specification Discussion]]^ | ||
<code> | <code> | ||
GROUP BY group_by_columns | GROUP BY group_by_columns | ||
[ HAVING [ left_operand operator subquery ] | [ HAVING [ left_operand operator subquery ] | ||
- | [ left_operand IN (subquery) ] ] | + | [ left_operand IN (subquery) ] ] |
</code> | </code> | ||
- | ==== ORDER BY Clause Syntax: ==== | + | ==== ORDER BY order_by_specification Syntax: ==== |
+ | ^See:^[[dev:sql:statements:select:order_by | ORDER By order_by_specfication Discussion ]]^ | ||
<code> | <code> | ||
- | ORDER BY [ column_spec | column_position ] [ ASC | DESC ] | + | ORDER BY [ column_spec | column_position ] [ ASC | DESC ] |
[, column_spec | column_position ] [ ASC | DESC ] | [, column_spec | column_position ] [ ASC | DESC ] | ||
</code> | </code> | ||
- | ==== WITH Clause Syntax: ==== | + | ==== WITH option_list: ==== |
<code> | <code> | ||
- | WITH options | + | WITH option_list |
</code> | </code> | ||
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The expression_list can be one of the following: | The expression_list can be one of the following: | ||
- | | * | All columns for the named tables using a syntax of [/[ database. ] table. ]] * | | + | | * | All columns for the named tables using a syntax of %%[%%%%[%%database.]table.]] * | |
| column_spec | A column optionally qualified by a database and table with an optional column_alias. | | | column_spec | A column optionally qualified by a database and table with an optional column_alias. | | ||
| (subquery) | A nested subquery that returns a single select item. | | | (subquery) | A nested subquery that returns a single select item. | | ||
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| $uniquekey | | | | $uniquekey | | | ||
| $odxid | | | | $odxid | | | ||
- | ==== FROM Clause ==== | ||
- | | ||
- | The From Datasource can be one of the following: | ||
- | | table_spec | A table using a syntax of [database.]table. | | ||
- | | $OMNIDEX | An internal table automatically created and used for testing consisting of one row and one column. | | ||
- | | (subquery) | A nested subquery. | | ||
- | | JOIN Clause | Joins one or more tables.| | ||
- | ==== WHERE Clause ==== | ||
- | The WHERE clause can be used to specify both criteria and table join information. | ||
- | select * from trans_table where state = 'CA'; | ||
| | ||
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==== GROUP BY Clause ==== | ==== GROUP BY Clause ==== | ||
==== HAVING Clause ==== | ==== HAVING Clause ==== | ||
- | ==== ORDER BY Clause ==== | ||
- | The ORDER BY clause returns selected rows in ascending or descending order by the specified column_spec or the ordinal position of a column_spec in the column list. | ||
- | select trans_date, trans_amount from trans_table order by trans_date; | ||
- | |||
- | select trans_date, trans_amount from trans_table order by 2; | ||
- | |||
- | The column_spec can be in the format of [database.][table.]column or table_alias.column. | ||
- | |||
- | select trans_date, trans_amount from trans_table order by db1.trans_table.trans_amount; | ||
- | |||
- | Column_spec can also be prefixed with an alias name of the table's column or an alias name of an expression. | ||
- | |||
- | select trans_date, trans_amount - discount NetAmount from trans_table order by NetAmount; | ||
- | |||
- | The ASC/DESC modifier can be used to return the data in ascending or descending order with ascending order being the default. | ||
- | |||
- | select trans_date, trans_amount from trans_table order by trans_date desc; | ||
==== WITH options ==== | ==== WITH options ==== | ||
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> select * from mytable; | > select * from mytable; | ||
- | |||
==== Select with Omnidex criteria on Quicktext column ==== | ==== Select with Omnidex criteria on Quicktext column ==== | ||
> select company, contact from mytable where company = 'inform*'; | > select company, contact from mytable where company = 'inform*'; | ||
+ | ==== Aggregates, Functions, Expressions ===== | ||
+ | |||
+ | SELECT customer_no, sum(amount) FROM orders GROUP BY customer_no ORDER BY 2; | ||
+ | |||
+ | SELECT customer_no, count(distinct order_no) FROM orders GROUP BY customer_no ORDER BY 2, 1; | ||
+ | |||
+ | ==== Select List Item Ordinal Numbers ==== | ||
+ | |||
+ | SELECT company, contact, state FROM customers ORDER BY 3; | ||
+ | |||
+ | SELECT company, contact, state FROM customers ORDER BY 3, 1; | ||
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