core/src/test/resources/sql/dual-table-query.iq

# dual-table-query.iq - Tests for DUAL table query
#
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# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
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# [CALCITE-6678] Support dual table query (enabled in MySQL, Oracle libraries)
!set outputformat mysql
!use scott-mysql

# MySQL supports users to specify the dual table, and also supports users not to specify the dual table.
SELECT 1 + 1 FROM DUAL;
+--------+
| EXPR$0 |
+--------+
|      2 |
+--------+
(1 row)

!ok

SELECT 1 + 1;
+--------+
| EXPR$0 |
+--------+
|      2 |
+--------+
(1 row)

!ok

# Oracle supports users to specify the dual table, but not supports users not to specify the dual table.
!use scott-oracle

SELECT 1 + 1 FROM DUAL;
+--------+
| EXPR$0 |
+--------+
|      2 |
+--------+
(1 row)

!ok

SELECT 1 + 1;
java.sql.SQLException: Error while executing SQL "SELECT 1 + 1": From line 1, column 1 to line 1, column 12: SELECT must have a FROM clause

!error

SELECT * FROM DUAL;
+--------+
| EXPR$0 |
+--------+
| X      |
+--------+
(1 row)

!ok

# End dual-table-query.iq