sql server column level encryption

An asymmetric key contains a database-level internal public and private key that can be used to encrypt and decrypt data in a SQL Server database, either imported from an external file or assembly, or generated in a SQL Server database. It is not like a certificate and canno

Certificates and asymmetric keys encrypt data using the internal public key at the database level, and data is decrypted using a database-level internal private key. Symmetric keys are relatively simple, and they contain a key for both encryption and decryption. In this case, encrypting the data with a symmetric key is faster and more appropriate for large data.

clustered index.Nonclustered: Used to specify that the index created is a nonclustered index.Index_name: Used to specify the name of the index being created.Table: Specifies the name of the table on which the index is created.View: Specifies the name of the view that created the index.asc| DESC: Used to specify an ascending or descending sort direction for a specific index column.Column: Used to specify the columns to be indexed.PAD_INDEX: Used to specify the space that remains open on each pag

SQL server often has the following problems:After a table uses columns with automatic numbers, tens of thousands of columns have been automatically numbered due to a large amount of data being tested. Now we are using this table, and the test data has been deleted. The legacy problem is that we are entering new data and the number will only be increased, deleted numbers cannot be used. Who knows how to solv

I. Definition and characteristics of the identity columnThe identity column in SQL Server is also called the identifier column, which is also known as the self-increment column.This type of column has the following three characteristics :1. The data type of the

Problem Security is a major consideration for any company. Database backups are easily stolen and restored to another instance of SQL Server. As we explore the new features of SQL Server 2008, we are interested in a feature called Transparent data encryption, which we can u

Note: SQL Server 2005 and above support. Version estimates are not supported (working environment 2005,2008). To work, you need to add a new column to the existing table in SQL Server and add a description. Thus there is a stored procedure as follows. (Attach the stored pro

later level, and at this point, the understanding of nonclustered indexes is not very important.As with white pages, a SQL Server index is maintained in the search key sequence to access any particular entry in a small set of "jumps." Given a search key, SQL Server can quic

It is very easy to create the same symmetric key. The symmetric keys created using the same key_source, algorithm, and Identity_value key options will be the same.--Create test use [temp]go--drop table enrypttest CREATE TABLE enrypttest (ID int not NULL PRIMARY key, Enryptdata nvarchar (+),) Goinsert into enrypttest values (1,n ' 888888 '), (2,n ' 888888 '), (3,n ' 123456 '), (4,n ' A '); Goalter table Enrypttest add symmetriccol varbinary (max) go select * from Enrypttest; --Delete test info

There are a couple of concepts to talk about before you start."Overwrite Query"When an index contains all the columns referenced by a query, it is often referred to as an "overwrite query.""Index Overlay"If the returned data column is contained in the key value of the index, or is contained in the key value of the index + the key value of the clustered index, then Bookup Lookup does not occur, because the index entry is found, and there is no need to

generation of table and column comment code for SQL Server 2000 (Extended. PowerDesinger organizes the defined features in a tree structure (Figure 4). The job of this article is to define the features of Script code. We need to modify the Script feature code in Script \ Objects \ Table \ TableComment and Script \ Objects \