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8 mar 2021 · select jobs, decode(salary, null, 0, salary) as salary from your_table Or CASE. select jobs, case when salary is null then 0 else salary end as salary from your_table
The Oracle NVL() function allows you to replace null with a more meaningful alternative in the results of a query. The following shows the syntax of the NVL() function: NVL(e1, e2) Code language: SQL (Structured Query Language) (sql) The NVL() function accepts two arguments. If e1 evaluates to null, then NVL() function returns e2.
DROP TABLE null_test_tab; CREATE TABLE null_test_tab ( id NUMBER, col1 VARCHAR2(10), col2 VARCHAR2(10), col3 VARCHAR2(10), col4 VARCHAR2(10) ); INSERT INTO null_test_tab values (1, 'ONE', 'TWO', 'THREE', 'FOUR'); INSERT INTO null_test_tab values (2, NULL, 'TWO', 'THREE', 'FOUR'); INSERT INTO null_test_tab values (3, NULL, NULL, 'THREE', 'FOUR ...
Null functions. Oracle Database includes many functions to help you handle nulls. NVL and coalesce are two that map nulls to non-null values. NVL. This takes two arguments. If the first is null, it returns the second: select toy_name, volume_of_wood, nvl ( volume_of_wood , 0 ) mapped_volume_of_wood from toys; Coalesce. This is like NVL.
Use a null when the actual value is not known or when a value would not be meaningful. Oracle Database treats a character value with a length of zero as null. However, do not use null to represent a numeric value of zero, because they are not equivalent.
30 lip 2023 · you'd have to use a gtt - flow the results of select ssn, max (pants) max_pants from test2 group by ssn; into a gtt with a primary key on ssn and then update the join update (select pants, max_pants from test, gtt where test.ssn = gtt.ssn and test.pants > to_date ( .... ) ) set pants = max_pants;
The MySQL IFNULL() function lets you return an alternative value if an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + IFNULL(UnitsOnOrder, 0)) FROM Products;
