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Create student table using sql statement

Create student table using sql statement

How to create a student table using sql statements: first open a new query in sql and create a new table; then enter the student number and name, and the type is represented by characters; then enter the gender, age, and major; finally click execute.

Mar 25, 2021 am 11:31 AM
sql 学生表
What are the SQL delete statements?

What are the SQL delete statements?

SQL delete statement: 1. The delete statement is used to delete rows in the table; 2. drop [delete table] deletes content and definitions, and releases space; 3. truncate [clears data in the table], deletes content, releases space but does not delete definition.

Mar 24, 2021 pm 05:36 PM
sql 删除语句
Introduction to SQL triggers and their advantages and disadvantages

Introduction to SQL triggers and their advantages and disadvantages

In this tutorial, we will briefly cover the advantages and disadvantages of SQL triggers. A SQL trigger is a set of SQL statements stored in a database catalog. A SQL trigger is executed or fired whenever an event associated with a table occurs, such as an insert, update, or delete.

Mar 19, 2021 am 11:17 AM
SQL触发器
Are you sure SQL injection is dead?

Are you sure SQL injection is dead?

For a long time, I thought that the most common security problem in back-end development was SQL injection. Through the magical SQL writing method of where 1=1, you can easily attack a problematic system, and eventually evolve into the existence of artifacts such as sqlmap.

Mar 15, 2021 am 09:46 AM
SQL注入
What is a sql injection statement?

What is a sql injection statement?

There are three types of SQL injection statements, namely: 1. Numeric injection point, with statements such as "select * from table name where id=1 and 1=1"; 2. Character injection points, with statements such as "select * from table name where name..."; 3. Search injection point.

Mar 10, 2021 pm 02:01 PM
sql
Quietly share 6 SQL query tips

Quietly share 6 SQL query tips

SQL queries are often used and operated frequently, friends in need can take a look; the six methods are introduced separately, the methods are simple and easy to understand, and can be collected and learned.

Feb 26, 2021 am 09:57 AM
SQL查询
What is the order of execution of sql statements?

What is the order of execution of sql statements?

SQL statement execution order: 1. From tab is executed first; 2. Where statement limits the conditions; 3. Grouping statement [group by... having]; 4. Aggregation function; 5. Select statement; 6. Order by sorting statement.

Feb 22, 2021 pm 04:23 PM
sql 执行顺序
What is the difference between left join and right join in sql

What is the difference between left join and right join in sql

The difference between left join and right join in SQL: 1. Left join can retrieve data as long as there are records in the left table, while right join only needs records in the right table; 2. Left join is based on the data in the left table. , and the right join is the reverse join of the left outer join.

Feb 22, 2021 pm 02:15 PM
sql 左连接 右连接
How to enter data after sql creates table

How to enter data after sql creates table

After sql creates a table, you can use the ALTER TABLE statement to input data. The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. If you need to add columns to the table, you can use the syntax "ALTER TABLE table_name ADD column_name.. ."

Feb 19, 2021 am 10:18 AM
sql
Can sql injection be entered directly through a web form?

Can sql injection be entered directly through a web form?

SQL injection can generally be entered directly through a web form. SQL injection means that the web application does not judge the legality of user input data or does not strictly filter it. Attackers can add additional SQL statements to achieve illegal operations.

Feb 18, 2021 pm 05:09 PM
sql注入 表单
Execution of a SQL statement

Execution of a SQL statement

The MySQL driver helps us connect to the database at the bottom level. Only after the connection is established can subsequent interactions be possible. Using a connection pool greatly saves the overhead of constantly creating and destroying threads. This is the famous "pooling" idea, which can be seen in both thread pools and HTTP connection pools.

Feb 17, 2021 am 10:32 AM
SQL
Introduction to database sql view

Introduction to database sql view

View introduction A view (View) is a virtual table that is basically transparent to users who use the view. The view does not actually exist in the database. The row and column data come from the tables used in the query of the custom view and are dynamically generated when the view is used. Define the view create view view name as select statement SELECT * FROM provinces;CREATE VIEW v_pro AS SELECT * FROM provinces;SELECT * FROM v_pro; View view When viewing the table, the view table will also be listed show table

Feb 04, 2021 am 07:58 AM
sql视图
Does the sql statement between include boundary values?

Does the sql statement between include boundary values?

In SQL Server, the SQL statement "between and" includes boundary values, and "not between" does not include boundary values. The "BETWEEN ... AND" statement selects a range of data between two values; these values ​​can be numeric, text, or dates.

Feb 03, 2021 pm 04:38 PM
sql语句 between
shock! There are so many locks in one SQL statement...

shock! There are so many locks in one SQL statement...

The concept of gap lock is indeed a bit difficult to understand, especially after working with uplink lock, it is easy to make mistakes in judging whether lock waiting will occur. So today, let’s start with this locking rule. First of all, let me explain that I have not seen a similar summary of these locking rules elsewhere. In the past, when I made my own judgments, I always thought about the implementation in the code. This time, in order to summarize the rules into rules that students who don’t read the code can understand, I re-brushed the code and temporarily summarized it.

Feb 02, 2021 pm 05:53 PM
SQL 锁

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