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3 Ιαν 2013 · just add null and the value to decode to in your decode string. select decode('&partitions', 'true', 'CreateTablesPartitions', null, 'itsnull', 'CreateTables') scr from dual; so if its null, then the result will be itsnull
1 Ιουν 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;
Oracle DECODE() function and NULL. NULL cannot be compared to anything even NULL. However, DECODE() function treats two null values are being equal. The following statement returns the string Equal: SELECT DECODE (NULL, NULL, 'Equal', 'Not equal') FROM dual; Code language: SQL (Structured Query Language) (sql)
DECODE. The DECODE function is not specifically for handling null values, but it can be used in a similar way to the NVL function, as shown by the following example. SQL> SELECT id, DECODE(col1, NULL, 'ZERO', col1) AS output FROM null_test_tab ORDER BY id; ID OUTPUT ----- ----- 1 ONE 2 ZERO 3 ZERO 4 ZERO 4 rows selected.
Purpose. DECODE compares expr to each search value one by one. If expr is equal to a search, then Oracle Database returns the corresponding result. If no match is found, then Oracle returns default. If default is omitted, then Oracle returns null.
In Oracle Database the empty string is NULL; this is different from many other RDBMSes where the empty string is not null. The empty string. ... the other when it has a value. This produces a plan that can use an index if EMP_ID is provided and a full table scan if it's not. NVL optimization. declare emp_id number := 100; begin for rws in ...
14 Ιουν 2007 · How can I check if a field is not null in a decode statement. select decode(field1, not null, 'Y', 'N')
