TOP ( can be either a number or a percentage of the rows.
The rows referenced in the TOP expression are not arranged in any order. The TOP clause is applied after the entire source table and the entire target table are joined and the joined rows that do not qualify for an insert, update, or delete action are removed.
Let us clean up the clause by dropping the tables which we have created.performance wise I liked; (not my! guess you already covered it somewhere..; WITH CTE AS (SELECT T1. When asked the reason was he had no idea how to use multiple tables with the help of the JOIN clause in the UPDATE statement. Additionally, we want to update the values of Col2 and Col3 only. When you look at this it looks very simple but when we try to think the solution, I have seen developers coming up with many different solutions for example sometime they write cursor, table variables, local variables etc. Col2)) UPDATE CTE SET Col1 = _Col1, Col2 = _Col2from stackoverflow.“UPDATE Table1 SET Col2 = t2. Note: You cannot run an update query in a Web browser.If you want to run an update query in an Access Web database, you must first open the database by using Access. If you are using an Access web app, you can use data macros to update or change existing data in a set of records.Performance Tip: The conditional behavior described for the MERGE statement works best when the two tables have a complex mixture of matching characteristics.