Merge pull request #373 from sarahsimpers/DOCSP-22503

(DOCSP-22503) Adds WHERE EXISTS to list of allowed operations

Author: sarahsimpers

source/supported-operations.txt

@@ -37,6 +37,8 @@ Comparison Functions and Operators
      - Greater than or equal operator
    * - ``GREATEST()``
      - Return the largest argument
+   * - ``EXISTS()``
+     - Test for the existence of a record you specify in a subquery
    * - ``IN()``
      - Check whether a value is within a set of values
    * - ``INTERVAL(N,N1,N2,...)``