How to update all records in a table at the same time (without updating records one by one) using stored procedure

I have a 开发者_如何学JAVAtable named Emp wit (Empname,Details). There are 4 records in the table. I want to update all records with a single update statement, without updating records one by one, using a stored procedure.

 UPDATE [tableName] SET [columnName] = [value] WHERE [condition]