Select distinct case when sql

If your case variable is unique, you can certainly put the distinct keyword in the SQL CASE syntax directly: Count( distinct CASE when yearsold between and then case else null end) That way, each unique value of the case variable is counted only once. Here is the query to achieve required result along with the output. Note the usage of ‘ distinct ’ clause outside of case statement. VIPs, count( distinct case when not vip then customer else null end) as Not_VIPs from table group by city.

SQL Server gives you the ability to store mixed case data in your databases, but depending on how you create your databases SQL Server will ignore the case when you issue T- SQL commands. One of the problems you may be faced with is that you want to get a distinct list of values from a table to show. See the locations table in the sample database. Something went wrong on our end.

Distinct count with case statement. DISTINCT treats NULL values to be duplicates of each other. The primary key ensures that the table has no duplicate rows. However, when you use the SELECT statement to query a portion of the columns in a table, you may get duplicates.

Source: One or more tables present in the Database. Syntax of a SQL SELECT DISTINCT. SQL JOINS are used to join multiple table. For some reason, SQL Server will not allow this! Case insensitive SQL SELECT query FAQ: How do I issue SQL SELECT queries while ignoring case (ignoring whether a string is uppercase or lowercase)?

When I first started writing SQL queries I was using Postgresql, and used some of their custom regular expression capabilities to perform case -insensitive queries. In this case , you should run the query below that counts the unique values in the month column. This strange situation seems contradictory, but there’s a reason for it. In some situations, you may want to treat two null values as different from each other — in which case, use the UNIQUE predicate. Simple CASE expression: The simple CASE expression operates by comparing the first expression to the expression in each WHEN clause for equivalency.

If these expressions are equivalent, the expression in the THEN clause will be returned. Allows only an equality check. Select with distinct on two columns.

Usually it is better to rearrange the WHERE clause in the query to only get the rows you need. The SQL SELECT with 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. So in this case the statement will return distinct rows for FirstName and LastName. This works with all SQL databases I’ve use including Postgresql, MySQL, and SQL Server.

Run the SQL and view the result. Type the following SQL statement. Anybody have some good resources on using select distinct vs group by? I feel hesitant when using them and find myself confused as to which one to use or if there are times you need to use both. It is not uncommon to have duplicate data in the of a query.

How to add distinct in the following query. Rows are not anything like records.