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15 Μαρ 2012 · select NVL(type_id, 'Unknown') AS type_id, name from test_table group by NVL(type_id, 'Unknown'), name; Or. select COALESCE(type_id, 'Unknown') AS type_id, name from test_table group by COALESCE(type_id, 'Unknown'), 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;
To check if a value is NULL or not, you should use the IS NULL operator as follows: expression | column IS NULL. Code language: SQL (Structured Query Language) (sql) The IS NULL operator returns true if the expression or column is NULL. Otherwise, it returns false.
Is not null. To do the reverse, and find all the rows with a non-null value, use the "is not null" condition: select * from toys where volume_of_wood is not null;
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.
5 Ιαν 2016 · I want to decode on the null values of the columns. If the Order_no is null, it shows 'T' and if the Bol_No is null it shows 'P'. How do I place decode on this column?
16 Φεβ 2012 · 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.
