Mssql case when null

When subtracting 10 hours from VacationHours results in a negative value, VacationHours is increased by 40 hours; otherwise, VacationHours is increased by 20 hours.

In the AdventureWorks database, all data related to people is stored in the Person. Person table. For example, the person may be an employee, vendor representative, or a customer. The function returns the first and last name of a given BusinessEntityID and the contact type for that person. The statement returns the maximum hourly rate for each job title in the HumanResources.

Employee table. The HAVING clause restricts the titles to those that are held by men with a maximum pay rate greater than 40 dollars or women with a maximum pay rate greater than 42 dollars. The following TSQL will create a demo table and load it with some sample data for both integer and varchar typed columns.

The query above will replace any NULL values in the intdata column with a The first argument is the expression to be checked. It is important to note that the replacement value must be of a data type that is implicitly convertible to the same type as the check expression. So for example, if the column is an int data type, the replacement value must be an integer and not characters.

In the first query we do not use the function and we can see that there is no value for SalesOrderID Another good use case for this function is when inserting data into a table. Generally speaking, all data should be sanitized by the application but there could be cases in scripting when you want to covert a value before inserting into a table. The following example will insert a default date far in the future if a NULL date is passed in for the DiscontinuedDate column.

In both of these cases you are most concerned with the performance of finding the records to be updated and using functions in a WHERE clause will limit the query engine's ability to use an index. Also, LEN ' ' …. Toggle navigation Keyword-rank. Home Extension Country Pricing. Keyword Research: People who searched mssql case when null also searched. Frequently Asked Questions. Active 7 years ago. Viewed k times. Thanks in advance.

Improve this question. John Woo k 63 63 gold badges silver badges bronze badges. Trivial, but I believe forthcoming is one word. Add a comment. Active Oldest Votes. Improve this answer. John Woo John Woo k 63 63 gold badges silver badges bronze badges.