Your actual query is different than what you suggest in your question, and it looks more like this:. That is what the documentation means by "nesting" of CASE expressions, and will lead to this error message:. You should try it and then report back with your actual code and any actual errors you receive.
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Viewed k times. Improve this question. The CASE expression has two formats,. The simple CASE expression compares an expression to a set of simple expressions to determine the result. Both formats support an optional ELSE argument. Example Create SQL table that contains the below columns. In this last line of the query, we chose the manipulation method for the matched rows. Finally, we added the semicolon ; sign because the MERGE statements must end with the semicolon signs.
The major characteristic of the subquery is, they can only be executed with the external query. The noticeable difference in this method is, it might be a convenient way to update one column for the tables that have a small number of the rows. Now we will execute the following query and then will analyze it. After the execution of the update from a select statement the output of the table will be as below;. As we can see, the PersonCityName column data of the Persons table have been updated with the City column data of the AddressList table for the matched records for the PersonId column.
Regarding this method, we should underline the following significant points. If the subquery finds more than one matched row, the update query will return an error, as shown below:.
In this article, we learned to update the data in a table with the data where they are contained in other tables. PersonId INT. PersonName , PersonLastName. N 'Salvador' , N 'Williams' ,. N 'Lawrence' , N 'Brown' ,. N 'Gilbert' , N 'Jones' ,.
N 'Ernest' , N 'Smith' ,. N 'Jorge' , N 'Johnson'. 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. When a value does not exist, the text "Not for sale' is displayed. Skip to main content.
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