how to replace NULL value during insertion in sql

Question

my table looks like this

+--------+--------+--------------+--------------+
| CPI_id | Weight | score_100_UB | score_100_LB |
+--------+--------+--------------+--------------+
|    1.1 |     10 |          100 |           90 |
+--------+--------+--------------+--------------+

while executing the insert query the table should look like

+--------+--------+--------------+--------------+
| CPI_id | Weight | score_100_UB | score_100_LB |
+--------+--------+--------------+--------------+
|    1.1 |     10 |          100 |           90 |
|    5.5 |     10 |         NULL |           93 |
+--------+--------+--------------+--------------+

but NULL values should be replaced by 100. I also tried using trigger.I couldn't get.

thanks in advance

Answer 1

 select E.emp_name as Employee, ISNULL( M.emp_name,'No Manager') as Manager from Employee_Test_salary4 E left join Employee_Test_salary4 M on E.report_manager = M.report_manager or select E.emp_name as Employee, COALESCE( M.emp_name,'No Manager') as Manager from Employee_Test_salary4 E left join Employee_Test_salary4 M on E.report_manager = M.report_manager or select E.emp_name as Employee, CASE WHEN M.emp_name IS NULL THEN 'No Manager' ELSE M.emp_name END as Manager from Employee_Test_salary4 E left join Employee_Test_salary4 M on E.report_manager = M.report_manager 

Answer 2

Alter your table and set the field score_100_UB to have some default value like below

 ALTER TABLE t1 MODIFY score_100_UB INT UNSIGNED DEFAULT 100;

After this, whenever you try to insert a NULL value in this column, it will be replaced by 100

Answer 3

if you're using a query then use ISNULL() function

insert into table values (CPI_id , Weight ,ISNULL(score_100_UB ,100), score_100_LB )

Answer 4

For MySQL use:

insert into table values (CPI_id , Weight ,IFNULL(score_100_UB ,100), score_100_LB )

or:

insert into table values (CPI_id , Weight ,COALESCE(score_100_UB ,100), score_100_LB )

SQL Server:

insert into table values (CPI_id , Weight ,ISNULL(score_100_UB ,100), score_100_LB )

Oracle:

insert into table values (CPI_id , Weight ,NVL(score_100_UB ,100), score_100_LB )