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15 Μαρ 2012 · 3 Answers. Sorted by: 17. select decode(type_id, null, 'Unknown', type_id), name, count(*) from. ( select 'asdf' type_id, 'name1' name from dual union all. select 'asdf' type_id, 'name2' name from dual union all. select null type_id, 'name3' name from dual. ) test_table. group by type_id,name;
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;
SELECT DECODE (NULL, NULL, 'Equal', 'Not equal') FROM dual; Code language: SQL (Structured Query Language) (sql) In this tutorial, you have learned how to use the Oracle DECODE() function to add procedure if-then-else logic to SQL queries.
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. SQL> NVL2
20 Μαρ 2020 · I need to know that how TO_NUMBER works with NULL values, I am getting the error(ORA-01722) if I am trying to apply TO_NUMBER to VARCHAR2 column having NULL in it. Pls look at the structure SQL> desc letter_requests Name Null?
28 Ιαν 2008 · The question is whether to use a DECODE or NVL to cmpare a null value. Foe ex : declare name varchar2(10); begin Update emp set emp_name= nvl(name,emp_name); end; I ran the above query with sql_trace and after viewing the results using tkprof showed no difference.
14 Ιουν 2007 · How can I check if a field is not null in a decode statement. select decode(field1, not null, 'Y', 'N')
