[ WITH temporary-views ] query-block
  INTERSECT [ ALL | DISTINCT ] query-block
[ ORDER BY [ integer | select-list-expression-name ] [ ASC | DESC ], ... ]
[ FOR XML xml-mode ]
[ OPTION( query-hint, ... ) ]

query-block : See Common elements in SQL syntax.

query-hint :
MATERIALIZED VIEW OPTIMIZATION option-value
| FORCE OPTIMIZATION
| option-name = option-value

option-name : identifier

option-value : 
hostvar (indicator allowed)
| string
| identifier
| number

INTERSECT computes the set intersection between the result sets of two query blocks. Note that query blocks can be nested, and can in turn be comprised of nested SELECT statements or the set operators UNION, EXCEPT, or INTERSECT. Specifying INTERSECT alone is equivalent to specifying INTERSECT DISTINCT.

INTERSECT ALL implements bag intersection rather than set intersection. For example, if the first query-block contains 5 (duplicate) rows with specific values, and the second query-block contains 3 duplicate rows with identical values to the first, then INTERSECT ALL will return 3 rows.

The results of INTERSECT are the same as INTERSECT ALL if either query-block does not contain duplicate rows.

The two query-block result sets must be UNION-compatible; they must each have the same number of items in their respective SELECT lists, and the types of each expression should be comparable. If corresponding items in two SELECT lists have different data types, SQL Anywhere chooses a data type for the corresponding column in the result and automatically convert the columns in each query-block appropriately.

The column names displayed are the same column names that are displayed for the first query-block and these names are used to determine the expression names to be matched with the ORDER BY clause. An alternative way of customizing result set column names is to use a common table expression (the WITH clause).

Must have SELECT permission for each query-block.

None.

• EXCEPT statement
• UNION statement
• SELECT statement
• OPTION clause, SELECT statement

For examples of INTERSECT usage, see Set operators and NULL.