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SQL Injection(blind) 1. Low Manual injection method The server will only return and not display the search value. This kind of SQL injection without echo is called SQL blind injection. This question will only return whether the user exists or not, that is, true or false. This kind of blind note becomes Boolean blind note. The injection ...

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1.DMSQL classification DML (data management language) - insert - update - delete - select DDL (data definition language) - create - drop - alert - truncate DCL (data control language) - grant - revoke TCL (transaction control) - commit - rollback - savepoint 2. Writing specification of SQL statement Keywords cannot be abbrev ...

1, SQL overview SQL (structured Query Language) is a structured Query Language used to access, query, update data and manage relational database systems 1.1 SQL development SQL was introduced by IBM in 1981. Once it was applied in the database, it became the general specification of the database The specification of SQL is determined b ...

Meaning: it is also called multi table query. When the query fields come from multiple tables, the join query will be used Cartesian boarding phenomenon: Table 1 has n rows, table 2 has m rows, and the result = n*m rows Cause: there is no valid connection condition How to avoid: adding valid connection conditions Classification: 1. Classifi ...

Insert multiple messages at a time SQL34 link address: https://www.nowcoder.com/practice/51c12cea6a97468da149c04b7ecf362e?tpId=82&&tqId=29802&rp=1&ru=/ta/sql&qru=/ta/sql/question-ranking Title Description: The topic has already executed the following statement: drop table if exists actor; CREATE TABLE actor ( actor_id ...

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preface In all the explanations below, I will explain in the form of basic grammar, cases and links, so as to strengthen the use and understanding of each sentence. I don't need to return the results in the way of mapping. It really takes up space. This article was written by the author after finishing it all night. I hope you will praise it t ...

2, Condition query Syntax: select query list from table name where filter criteria;Function: filter the data of the original table according to the conditions and query the desired data. 1. Filter by conditional expression Conditional operator: > < > = < =! = < > Case 1: query employee information with salary ...