Sql Server CE can I delete TOP or only 1 record from table that matches my query

问题

select Top(1)* from TableName Where columnName=value

selects only the first row just fine. However if I change the select to a delete I get an error and can't figure out how to write a query to delete only 1 record that matches my query from the db.

I'm wondering if anybody out there smarter than I knows if or how this can be done in SQL CE.

回答1:

Did you try something like this?

DELETE TableName where IdColumn In ( select Top(1) IdColumn from TableName Where columnName=valuev)

回答2:

I don't know specifically as I'm at home, but SQL CE is deliberately restricted in what it can do. One reason for this is that it is 'always' running locally to the process referencing it.

What means is that it is Expected that the other process is expected to handle much of the logic that may otherwise be encapsulated in the SQL Server. This often results in firing several queries at the SQL CE instance, where you may be more accustomed to firing off one.

In this case, you could do it with two queries...
1) A query to identify the record that you want to delete
2) Use that Identifier in another query to do the actual delete

You could also try using SET ROWCOUNT 1 to limit the DELETE to just 1 row. But again, I don't know if that works in CE.

回答3:

You can use CTE such as

;with myTopRow(rowID)
(
    select Top 1 rowID from TableName Where columnName=value
)
delete from TableName inner join myTopRow on TableName.rowID = myTopRow.rowID

回答4:

Shouldn't it be rather :

DELETE FROM TableName WHERE columnName=value ORDER BY columnName LIMIT 1;

IMHO, the table logically has NO order by itself. It has it physically, but you can't rely on it. So, you HAVE to set the order in which you want to delete the first row.

回答5:

The following code will delete only first row

Dim mySqlCommondDelete As String = "DELETE BOOK_ID, MemberID FROM (SELECT TOP 1 * FROM ISSUE_BOOK) where BOOK_ID = Val(" & deleteBook & ") and MemberID = Val(" & msk & ")"

来源：https://stackoverflow.com/questions/8438548/sql-server-ce-can-i-delete-top-or-only-1-record-from-table-that-matches-my-query

标签

sql

sql-server-ce