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3 cze 2013 · You could use something like: SELECT * FROM TABLEX WHERE COALESCE(column2, '') = COALESCE(variableY, '') (COALESCE takes the first non NULL value) Note this will only work when you the column content cannot be '' (empty string). Else this statement will fail because NULL will match '' (empty string).
12 wrz 2012 · My issue is that I have a nested SELECT that can return null that I am comparing against based on a date parameter. SELECT a.* FROM Table_One a, Table_Two b WHERE a.Fieldc IN (SELECT CompareValue from Table_Three cv WHERE inDate between cv.Date_ and SYSDATE) AND a.Fielda = b.Fieldb(+)
30 lip 2020 · I thought we can only compare nulls to nulls in decodes or. nullif returns null if the first parameter is null. *null* 2 *null* <<<=== different. *null* *null* *null* <<<=== the same. I replace NULL with five 'X' characters which is greater. than the maximum length of C1 i.e VARCHAR2 (4).
Remember, comparisons against null always result in null, so queries can't use regular comparison operators like "=" or "!=". SQL> SELECT * FROM null_test_tab WHERE col1 = NULL ORDER BY id; no rows selected SQL>
Let’s take some examples of using the Oracle NVL2() function to understand how it works. A) Oracle NVL2() function with numeric data type example. The following statement returns two because the first argument is null. SELECT NVL2(NULL, 1, 2) -- 2 FROM dual; Code language: SQL (Structured Query Language) (sql) B) Oracle NVL2() function with ...
1 cze 2023 · Oracle DECODE Function with NULL Values. As I mentioned above, the Oracle DECODE function is an exception to other functions in how it handles NULL values. It treats a NULL expression and NULL search as equal (so NULL == NULL). So, this example will return 1: SELECT DECODE(NULL, NULL, 1, 0) FROM DUAL;
15 lut 2012 · I made an assumption about the Decode comparison following the "rule", but now notice the "disclaimer" at the end of the function's Purpose. 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.
