Count inside case statement sql

Use of sum and count inside a case statement in sql. I want to display sum of each column and count of each column of both the tables together in a single report. The purpose of the query is to count the number of unique (non-empty) last names. If the last name is empty, then count as unique.

I suppose the general case for this problem would be the use of an aggregate function within a case -when statement. Depending on you flavor of SQL , you can also imply the else statement. SUM Case statement where COUNT inside CASE statement – Learn more on the SQLServerCentral forums. SQL query with count and case statement. Best way to do nested case statement logic in SQL Server.

SQL case statement will look like when there are if and more than one inner if. How to do SQL count with nested Case statement. The CASE expression cannot be used to control the flow of execution of Transact- SQL statements , statement blocks, user-defined functions, and stored procedures. For a list of control-of-flow methods, see Control-of-Flow Language (Transact- SQL ). Because of this pairing, you might be tempted to call this SQL CASE WHEN, but CASE is the accepted term.

I am well versed in VBA and am fairly proficient within PLSQL but I have run into somewhat of a roadblock. What I am trying to accomplish is a count of variables within multiple case statements to give an ultimate count at the end. In your query, the CASE expression has a non-aggregate expression, UPPER(attk.status), as well as an aggregate expression, COUNT (attk.status). Note that the non-aggregate expression is outside of the aggregate expression. How to correctly use CASE when in Proc SQL to count some specific values of a VAR.

The CASE statement goes through conditions and returns a value when the first condition is met (like an IF-THEN-ELSE statement ). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSE clause. This article is a continuation of SQL Server CASE Statement and CASE WHEN Examples.

Today we will learn about Nested Case Statement in SQL Server. We can nest CASE statements similar to nested ifs that we find in most programming languages. I use a CASE statement to perform a COUNT all the time.

Usually I do this to set a condition, usually time based. Expressions return scalar values. The problem is that you are not yet writing SQL. You are just mimicking a procedural language (which has IF-THEN-ELSE control statements ) AND sequential file system in SQL. This is how you correctly count within a case statement!

This gives the same result that a COUNT would without compromising your result set. Question: How can I write a SQL statement that performs a count of a column while also including a case statement ? Can you show an example query of count with case ? In SQL Server (Transact- SQL ), the CASE statement has the functionality of an IF-THEN-ELSE statement. You can use the CASE statement within a SQL statement.

If there is no ELSE part and no conditions are true, it returns NULL. Using CASE statement within GROUP BY.