This script returns 2:
SET sql_mode=ORACLE;
|
SELECT DECODE(NULL,NULL,1,2) AS a FROM DUAL;
|
+------+
|
| a |
|
+------+
|
| 2 |
|
+------+
|
DECODE is internally implemented using Item_func_case, which treats two NULL values as not equal, so therefore the default value 2 is returned.
Oracle database works differently:
In a DECODE function, Oracle considers two nulls to be equivalent. If expr is null, then Oracle returns the result of the first search that is also null.
The above query returns 1 in Oracle:
SELECT DECODE(NULL,NULL,1,2) AS a FROM DUAL;
|
This script demonstrates the same problem, now using a table column instead of an explicit NULL literal:
SET sql_mode=ORACLE;
|
DROP TABLE t1;
|
CREATE TABLE t1 (a VARCHAR(10));
|
INSERT INTO t1 VALUES (NULL);
|
SELECT a, DECODE(a,NULL,1,2) AS da FROM t1;
|
MariaDB returns:
+------+------+
|
| a | da |
|
+------+------+
|
| NULL | 2 |
|
+------+------+
|
Oracle database returns:
A DA
|
---------- ----------
|
1
|
DECODE should be fixed to treat two NULL values as equivalent.
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