If you omit the WHERE clause, all records in the table will be updated! The WHERE clause specifies which record(s) that should be updated.The server then processes these statements and returns result sets to the client program.To learn more about SQL programming, Indiana University students, faculty, and staff can register for instructor-led workshops offered by UITS IT Training.are metadata about the data within a table and they're created and updated on a column-by-column basis, not on the entire table.The database engine employs statistics when generating execution plans that are used to access data stored within the database.
If you have a table that stays at approximately the same number of rows, but data is added and removed on a regular basis, your statistics will become out of date rather quickly.The CTE result set is derived from a simple query and is referenced by UPDATE statement.Common table expressions can also be used with the SELECT, INSERT, DELETE, and CREATE VIEW statements. For information about table hints, see , 'expression' should be prefixed with the capital letter 'N'.Columns contain the column name, data type, and any other attributes for the column. Specifies the temporary named result set or view, also known as common table expression (CTE), defined within the scope of the UPDATE statement.