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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 SQL Server ISNULL() function lets you return an alternative value when an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + ISNULL(UnitsOnOrder, 0)) FROM Products;
Using the NVL function we replace the null values with 'ZERO'. SQL> SELECT id, NVL (col1, 'ZERO') AS output FROM null_test_tab ORDER BY id; ID OUTPUT ---------- ---------- 1 ONE 2 ZERO 3 ZERO 4 ZERO 4 rows selected. DECODE.
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 )
Nulls can appear in columns of any data type that are not restricted by NOT NULL or PRIMARY KEY integrity constraints. 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.
select t.*, coalesce ( volume_of_wood , 0 ) coalesce_two, coalesce ( times_lost, volume_of_wood , quantity_of_stuffing, 0 ) coalesce_many from toys t; You can use these functions in the where clause to map nulls to a real value.
NULL w SQL w bazie Oracle oznaczona jest wartość która jest pusta lub nie ma znaczenia. Wartości null mogą pojawić się w kolumnach dowolnego typu danych, na które nie są nałożone ograniczenia NOT NULL lub kolumna nie jest oznaczona jako PRIMARY KEY.
