Updating rows in sql
Using T-SQL to insert, update, or delete large amounts of data from a table will results in some unexpected difficulties if you’ve never taken it to task.
Let’s say you have a table in which you want to delete millions of records.
In this article I will demonstrate a fast way to update rows in a large table Consider a table called which has more than 5 millions rows.
Suppose you want to update a column with the value 0, if it that column contains negative value.
Order ID == 11000 select ord; // Execute the query, and change the column values // you want to change. Ship Via = 2 ' Insert any additional changes to column values.
Combine the top operator with a while loop to specify the batches of tuples we will delete.
For more information, see WITH common_table_expression (Transact-SQL). For information about table hints, see Table Hints (Transact-SQL).
TOP ( ) Specifies one or more table hints that are allowed for a target table. @ Note When referencing the Unicode character data types nchar, nvarchar, and ntext, 'expression' should be prefixed with the capital letter 'N'.
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