doeas anyone knows how to update a table where column = @parameter WHERE SELECT
Basically I have a table with the following values. Table name is UserAttribute
ID|Name |Properties| 17|Description|Student | 17|Contact |JohnDoe | 18|Description|Worker | 18|Contact |MaryJane |
I can update the fields with the following query:
UPDATE UserAttribute SET Properties = 'Charlie' WHERE Name = 'Contact' AND ID = 17
For the results I need I would need a query something like:
UPDATE UserAttribute SET Properties = @parameter WHERE Name = Contact AND ID = (SELECT HouseNo,ID FROM Table2 t1 JOIN UserAttribute t2 ON t1.ID =t2.UserID WHERE HouseNo = @HouseNo)
SQL doesnt allows the execution of such a query. Any suggestion on how to write the select statement in the WHERE clause?
Maybe the question is not the clearest, but its a bit hard to formulate a question when the problem I have is also hard to understand. Therefore I will try to write some kind of pseudo-code, hoping that it will make it a bit more clear.
UPDATE table SET Column = 'value' WHERE Column2 = value AND column 3 =(SELECT column from other tables)
You’re close, but when you introduce two tables, you have to be consistent with the alias. So
at the declaration of the update statement, you’d want to start with:
UPDATE ua1 SET properties = 'Charlie'
Then create a from clause just as you would with a select statement, declaring your aliases:
FROM UserAttribute ua1 INNER JOIN UserAttribute ua2 ON ua2.UserID = ua1.id WHERE ua1.name = 'Contact';