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8 mar 2021 · select jobs, coalesce(salary, 0) as salary. from your_table. Or DECODE. 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. For example (based on scott's EMP table):
14 sty 2022 · You can use any of the option below. Using NVL () SELECT ID ,NVL (NAME, 0) FROM TEST; Using ANSI standard coalesce () SELECT ID ,coalesce (NAME, '0') FROM TEST; Using CASE. SELECT ID ,CASE WHEN NAME IS NOT NULL THEN NAME ELSE '0' END FROM TEST; DEMO. edited Nov 14, 2017 at 8:56.
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 )
Alternatively you can use a function like NVL to map NULLs to a value such as zero. Find all employees with less than 0.2% commission - fixed v2. select employee_id, first_name, last_name, commission_pct from hr.employees where nvl ( commission_pct, 0 ) < 0.2 fetch first 10 rows only. EMPLOYEE_ID.
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.
The NVL function allows you to replace null values with a default value. If the value in the first parameter is null, the function returns the value in the second parameter. If the first parameter is any value other than null, it is returned unchanged. We know that COL1 in the test table contains null in all rows except the first.
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.
