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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;
15 Μαρ 2012 · 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;
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.
31 Ιαν 2013 · if you have an ORDER BY, and the data is not sorted in ORDER, then you have hit a bug. I understand you to say "i have an order by, but when I have a desc index the data is sorted wrong". If that is accurate, it is a bug.
28 Ιαν 2008 · Another straightforward way to see that DECODE and CASE both "short circut": SQL> select DECODE(1, null, 1/0, 777) from dual; DECODE(1,NULL,1/0,777) ----- 777 SQL> select CASE WHEN 1 = 2 THEN 1/0 ELSE 777 END 2 from dual; CASEWHEN1=2THEN1/0ELSE777END ----- 777 E.g. '1/0' had never been evaluated and everything went fine.
The Oracle/PLSQL DECODE function has the functionality of an IF-THEN-ELSE statement. Syntax. The syntax for the DECODE function in Oracle/PLSQL is: DECODE( expression , search , result [, search , result]... [, default] ) Parameters or Arguments. expression. The value to compare.
27 Δεκ 2023 · The Oracle DECODE function behaves similar to an IF-THEN-ELSE statement. It compares the first argument with the second argument. If they are equal, DECODE returns the third argument. If they are not, DECODE returns the fourth argument, if specified, or NULL if not.
