Length 16, decimal number 5

In the era of big data, the type and size of data in the database system is constantly expanding, which brings certain challenges to database management. In social production and life, the application scope of the database is gradually increasing, and improving the efficiency of database development and application is the key to guarantee the efficient operation of social production and life in China.

SQL, as a set of operational commands, is widely welcomed by the industry for its rich functionality, and has become a guarantee to improve the efficiency of database operations.

The application of SQL Server database can effectively improve the speed of data request and return, and effectively respond to the processing of complex tasks, which is the key to improve the efficiency of the work.

Extended information:

Before we learn about SQL, let's start by learning about it. Let us have a basic understanding of the SQL language, introduce the composition of the SQL language:

1, a SQL database is a collection of tables (Table), which is defined by one or more SQL schema.

2, a SQL table consists of a set of rows, a row is a sequence (collection) of columns, each column and row corresponds to a data item.

3, A table is either a base table or a view. A basic table is a table actually stored in the database, while a view is a definition of a table consisting of a number of basic tables or other views.

4. A basic table can span one or more storage files, and a storage file can also hold one or more basic tables. Each storage file corresponds to one physical file on external storage.