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SQL Update Statement

Syntax: UPDATE TableName Set ColumnName=Value WhereColumnName2=Value2

If we wanted to update the records from our table 'Members_tbl' in Diagram 1 where the LastName is Jones AND City is equal to Belfast and change the City column value to Belfast we could use the following update SQL statement.

UPDATE Members_tbl Set City='Dublin' Where LastName='Jones' AND City='Belfast'

Diagram 1

Diagram 2 shows the results of running our SQL Update.

Diagram 2

If you were to run an SQL Update statement to update all the rows in our table 'Members_tbl' (as it was in Diagram 1) where the City column held the value Belfast then this would have an effect of updating more than one record in our example.
You could also introduce OR as our SQL update statement does below.

UPDATE Members_tbl Set City='Dublin' Where FirstName='Dave' OR City='Belfast'