Sql updating multiple rows
If you incorrectly specify your search condition you might update too many rows, or not enough rows.
Additionally if you forget the WHERE clause altogether, you will update the entire table when you might not intend to.
If you do not use unique indexes in the join, or some other way to ensure that there is a one to one correspondence, you will be altering great big patches of data.
If you are performing an update query, which modifies the data, you should be very careful to get it right.
To update the row that was found I used the “SET” clause of the UPDATE statement, which set the new Toy Name to the correct spelling of “Magic Wand”.
You need to be careful when using the UPDATE statement with a .
It looks like some of the information in our Movies database might be incorrect, so go ahead and fix them through the exercises below.
If you are an application programmer then you will more than likely need to write TSQL code to update your SQL Server database tables.
query to make sure you are updating the right rows, and only then writing the column/value pairs to update.
The result will be that all your rows will be based on the last row selected by each subquery.
I can't imagine why you'd want that, so I assume you don't.
I am not able to compile the query which you have given.. and when i try to update the table i am getting using below code... Thanks and Regards, Venkat On Tue, Oct 26, 2010 at PM, Alban Hertroys SQL state: 21000"You're probably looking for UPDATE table FROM other_table.
update parcelsdata set gid=(select random() * 10), kasarano=(select kasarano from parcelsdata), murabano=(select murabano from parcelsdata), the_geom = (select (st_dump(st_polygonize(st_union(st_boundary(the_geom), the_line))))as the_geom from (select gid,kasarano,murabano,st_linefromtext(' LINESTRING('