Sql server case in update

Thus, all rows have a valid value. Now let us create another table with empid and sal columns as listed in employee table. Please note that we have inserted the same empid from the employee table in the emp table, but the sal column is NULL for three employees.

Now, we want to update table emp and set the sal column value equal to the sal column in the employee table.

In the following query, we need to use a CASE expression with the update statement. Create A. Understanding Thread Starvation in. NET Core Applications. Exploring Numeric Streams In Java. What Is The Metaverse. In this case you'd better off joining with that table, to get decent performance. Do you have a list of values in your C code or do you get them as a result of another SQL query? For 1.

Having them in a table is definitely better. You can only have about parameters, and once you have more than that, your sp would break. But no such problem with UDT. Show 6 more comments. Active Oldest Votes. I'm using your third option and it works great.

Improve this answer. Community Bot 1 1 1 silver badge. Vladimir Baranov Vladimir Baranov Black, If I had, say, 30K rows to update, I'd call the stored procedure three times and pass 10K IDs to it during each call in the table-valued parameter. Actually, nowadays with modern hardware and networks I'd start bothering with batches maybe after K or more. Add a comment. Gordon Linoff Gordon Linoff 1. EDIT: Perl pseudocode as described below:!

Laserbeak Laserbeak 78 5 5 bronze badges. I thought the data was coming from your program, not another table. IT's not entirely clear.

We do not want to insert value 0 and 1 for Male and Female employees. We need to insert the required values M and F for employee gender. In the following query, we specified variables to store column values. In the insert statement, you can we are using a Case statement to define corresponding value to insert in the employee table.

In the Case statement, it checks for the required values and inserts values from THEN expression in the table. In the following screenshot, we can see the newly inserted row contains Gender M instead of value 0. It also adds versatility to SQL Server queries. You should practice the Case statement in your queries. When expression1 Then Result1. When expression2 Then Result2. ELSE Result. ELSE other. Select EmployeeName ,. Else 'Director'. Select EmployeeName , Gender , Salary.

Min salary as MinimumSalary ,.