Details
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Task
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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None
Description
SELECT * FROM dual; |
ERROR 1096 (HY000): No tables used |
The DUAL table has one column, DUMMY, defined to be VARCHAR2(1), and contains one row with a value X
https://docs.oracle.com/cd/B19306_01/server.102/b14200/queries009.htm
select * from test join dual; |
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'dual' at line 1 |
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select * from dual join test; |
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'join test' at line 1 |
So the "correct" results in oracle terms should be:
select * from `DUAL`; |
+-------+ |
| DUMMY |
|
+-------+ |
| X |
|
+-------+ |
|
|
select * from test join `DUAL`; |
+----+--------------+---------------------+-------+ |
| id | data | ts | DUMMY |
|
+----+--------------+---------------------+-------+ |
| 1 | Some bla bla | 2018-06-07 22:03:52 | X | |
+----+--------------+---------------------+-------+ |
|
|
select * from `DUAL` join test; |
+-------+----+--------------+---------------------+ |
| DUMMY | id | data | ts |
|
+-------+----+--------------+---------------------+ |
| X | 1 | Some bla bla | 2018-06-07 22:03:52 | |
+-------+----+--------------+---------------------+ |
This could matter because the dual table is fundamental in Oracle world and many internal and external queries may rely on exactly this behaviour...