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Since critical information like credit card numbers are stored in column or two, it does not make sense to encrypt the complete database or database files.
In this tip I will walk through the processes of encrypting a column in a table which contains credit card information of customers of XYZ company by using SQL Server symmetric key encryption.
Columns contain the column name, data type, and any other attributes for the column. But you can easily extend this technique to come up with complex query statements. For our purpose the data is arranged like this: As you can see, the data has to be in a tabular format so that you can easily generate the query statements. The prudent use of temporary tables can dramatically improve Oracle SQL performance.To illustrate the concept, consider the following example from the DBA world.