SELECT Statements
A SELECT statement can consist of the following basic clauses.
- SELECT
- INTO
- FROM
- JOIN
- WHERE
- GROUP BY
- HAVING
- UNION
- ORDER BY
- LIMIT
SELECT Syntax
The following syntax diagram outlines the syntax supported by the ServiceNow adapter:
SELECT {
[ TOP <numeric_literal> | DISTINCT ]
{
*
| {
<expression> [ [ AS ] <column_reference> ]
| { <table_name> | <correlation_name> } .*
} [ , ... ]
}
[ INTO csv:// [ filename= ] <file_path> [ ;delimiter=tab ] ]
{
FROM <table_reference> [ [ AS ] <identifier> ]
} [ , ... ]
[
JOIN <table_reference> [ ON <search_condition> ] [ [ AS ] <identifier> ]
] [ ... ]
[ WHERE <search_condition> ]
[ GROUP BY <column_reference> [ , ... ]
[ HAVING <search_condition> ]
[ UNION [ ALL ] <select_statement> ]
[
ORDER BY
<column_reference> [ ASC | DESC ] [ NULLS FIRST | NULLS LAST ]
]
[
LIMIT <expression>
[
{ OFFSET | , }
<expression>
]
]
} | SCOPE_IDENTITY()
<expression> ::=
| <column_reference>
| @ <parameter>
| ?
| COUNT( * | { [ DISTINCT ] <expression> } )
| { AVG | MAX | MIN | SUM | COUNT } ( <expression> )
| NULLIF ( <expression> , <expression> )
| COALESCE ( <expression> , ... )
| CASE <expression>
WHEN { <expression> | <search_condition> } THEN { <expression> | NULL } [ ... ]
[ ELSE { <expression> | NULL } ]
END
| <literal>
| <sql_function>
<search_condition> ::=
{
<expression> { = | > | < | >= | <= | <> | != | IS NULL | IS NOT NULL | AND | OR | LIKE | NOT LIKE | CONTAINS | IN } [ <expression> ]
} [ { AND | OR } ... ]
Examples
- Return all columns:
SELECT * FROM incident
- Rename a column:
SELECT "priority" AS MY_priority FROM incident
- Cast a column's data as a different data type:
SELECT CAST(priority AS VARCHAR) AS Str_priority FROM incident
- Search data:
SELECT * FROM incident WHERE category = 'request'
- The ServiceNow APIs support the following operators in the WHERE clause: =, >, <, >=, <=, <>, !=, IS NULL, IS NOT NULL, AND, OR, LIKE, NOT LIKE, CONTAINS, IN.
SELECT * FROM incident WHERE category = 'request';
- Return the number of items matching the query criteria:
SELECT COUNT(*) AS MyCount FROM incident
- Return the number of unique items matching the query criteria:
SELECT COUNT(DISTINCT priority) FROM incident
- Return the unique items matching the query criteria:
SELECT DISTINCT priority FROM incident
- Sort a result set in ascending order:
SELECT sys_id, priority FROM incident ORDER BY priority ASC
Aggregate Functions
For SELECT examples using aggregate functions, see Aggregate Functions.
JOIN Queries
See JOIN Queries for SELECT query examples using JOINs.
Date Literal Functions
Date Literal Functions contains SELECT examples with date literal functions.
Window Functions
See Window Functions for SELECT examples containing window functions.
Table-Valued Functions
See Table-Valued Functions for SELECT examples with table-valued functions.