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Technical Articles

Database

SQL

What is SQL's advanced and oriented operating language?

SQL is a highly non-procedural and set-oriented operating language. When using SQL to perform data operations, users only need to ask "what to do" instead of specifying "how to do it". Therefore, users do not need to know the access path. The selection of the access path and the operation process of the SQL statement are automatically completed by the system; SQL uses sets Operation method.

Jul 24, 2020 pm 03:50 PM

sql 结构化查询语言

How to differentiate between left outer join, right outer join and full outer join?

A left outer join will return all records in the left table that are equal to the join fields in the right table; null if there is no data in the right table. A right outer join will return all records in the right table that are equal to the join fields in the left table; null if there is no data in the left table. A full outer join will return all records in the left and right tables that are equal to the join fields in the left and right tables.

Jul 21, 2020 pm 03:05 PM

左外连接右外连接全外连接

How to create a view in sql database?

How to create a view in sql database: 1. Log in to "sql server managment"; 2. Select "View" in the specified database, right-click and select the "New View" option; 3. Add the table to be associated; 4. The default is the primary key If it is related, you can adjust the related fields; 5. Press "ctrl+s" to save.

Jul 20, 2020 pm 02:40 PM

sql数据库视图

What is the extension of access?

The access file extension before the 2007 version is [mdb]; the access file extension after the 2007 version is [accdb]. [Microsoft Office Access] is a database management system that Microsoft combines the graphical user interface of the database engine and software development tools.

Jul 18, 2020 am 11:02 AM

access

What are the three types of triggers?

The types of triggers are: DML triggers, DDL triggers and login triggers. Trigger is a method provided by [SQL server] to programmers and data analysts to ensure data integrity; it is a special stored procedure related to table events; its execution is triggered by events.

Jul 18, 2020 am 09:17 AM

触发器 sql

How to create a database in sql server?

Visual creation can be done through the Sql Server Management Studio management tool. Method: 1. Log in to the management tool; 2. Right-click "Database" and select the "New Database" option; 3. In the pop-up window, enter the database name, set the database parameter values, and click "OK".

Jul 17, 2020 am 11:08 AM

sql server

What is the English abbreviation of database?

The English abbreviation of database is: "DB" (Database). "DBMS" stands for Database Management System; a database is a collection of data that is stored together according to certain rules, can be shared with multiple users, has as little redundancy as possible, and is independent of applications.

Jul 16, 2020 pm 05:18 PM

数据库

What are the stages of database design?

According to the standardized design method, database design is divided into six stages: 1. Requirements analysis; 2. Conceptual structure design; 3. Logical structure design; 4. Database physical design; 5. Database implementation; 6. Database operation. and maintenance.

Jul 16, 2020 pm 01:38 PM

数据库设计阶段

What is the difference between left join, right join, inner join and full outer join?

Difference: Left join returns all records in the left table and records with equal join fields in the right table; right join returns all records in the right table and records with equal join fields in the left table; inner join only returns records from both tables Join rows with equal fields; full outer join returns all records in the left and right tables and records with equal join fields in the left and right tables.

Jul 16, 2020 am 11:31 AM

SQl 左连接右连接内连接全外连接

Is sql the standard language for hierarchical databases?

SQL language is not a standard language for hierarchical databases, but a standard language for relational databases. Structured Query Language SQL is a comprehensive, versatile, and highly functional relational database language; used for accessing data and querying, updating, and managing relational database systems.

Jul 15, 2020 pm 04:05 PM

sql 数据库

What is the function of drop keyword in sql statement

The function of the drop keyword in the sql statement is to delete the table from the database. The drop statement will delete the table structure, as well as dependent constraints, triggers and indexes. After deletion, the stored procedures and functions that depend on the table will remain, but will become invalid.

Jul 14, 2020 pm 03:14 PM

sql drop 关键字

What is the command to update records in sql

The sql command to update records is UPDATE. The UPDATE command is used to modify or update data in mysql. This command can update one or more fields at the same time, and can also specify any conditions in the WHERE clause.

Jul 14, 2020 am 11:13 AM

sql 记录命令

What are the data structures used in relational database systems

The data structure used in relational database systems is a two-dimensional table. In a relational database system, all data is represented by a two-dimensional table structure, and these two-dimensional tables are usually called relationships. In a relational database, each relationship is a two-dimensional table.

Jul 13, 2020 pm 01:50 PM

关系数据库数据结构

What are the basic techniques for database recovery?

The basic techniques for database recovery are: 1. Data dump; 2. Register log files. Data dumping is the basic technique used in database recovery. Dumping is a process in which the DBA regularly copies the entire database to tape or another disk and saves it.

Jul 13, 2020 am 09:19 AM

数据库恢复基本技术