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> ]
  { 
    * 
    | { 
        <expression> [ [ AS ] <column_reference> ] 
        | { <table_name> | <correlation_name> } .* 
      } [ , ... ] 
  }
  [ INTO csv:// [ filename= ] <file_path> [ ;delimiter=tab ] ]
  { 
    FROM <table_reference> [ [ AS ] <identifier> ] 
  }
  [ WHERE <search_condition> ]
  [ 
    ORDER BY 
    <column_reference> [ ASC | DESC ] [ NULLS FIRST | NULLS LAST ]
  ]
} | 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

1. Return all columns:
   

   SELECT * FROM incident

2. Rename a column:
   

   SELECT "priority" AS MY_priority FROM incident

3. Cast a column's data as a different data type:
   

   SELECT CAST(priority AS VARCHAR) AS Str_priority FROM incident

4. Search data:
   

   SELECT * FROM incident WHERE category = 'request'

5. 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';

6. Return the number of items matching the query criteria:
   

   SELECT COUNT(*) AS MyCount FROM incident 

7. Sort a result set in ascending order:
   

   SELECT sys_id, priority FROM incident  ORDER BY priority ASC