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Technical Articles

Database

SQL

SQL introductory learning: A brief analysis of the usage of the UNION keyword

During our development process, we often use multiple query results to be displayed directly. So how should we query? This article is about learning SQL. Let’s take a look at the UNION keyword in SQL and how to use it. I hope it will be helpful to everyone!

Feb 21, 2022 am 10:55 AM

SQL UNION关键字

Let's talk about the simple manual SQL injection process

This article brings you some issues related to manual injection in SQL, including issues related to determining the injection point and determining the injection type. I hope it will be helpful to everyone.

Jan 28, 2022 pm 05:02 PM

sql

Let's talk about the isolation level achieved by MySQL transactions and MVCC

This article brings you some questions about the isolation level of MySQL transactions and how MVCC implements it. I hope it will be helpful to you.

Jan 26, 2022 pm 05:11 PM

sql

Take you to understand SQL injection (details)

This article brings you knowledge about SQL injection. SQL injection is a behavior in which the server does not strictly verify the data sent by the client, resulting in the server's SQL statement being maliciously modified and successfully executed. I hope it will be helpful to everyone.

Jan 04, 2022 pm 06:44 PM

sql注入

What are the paging methods in SQL server?

This article talks about the paging method of SQL server, using the SQL server 2012 version. In the following, pageIndex is used to represent the number of pages, and pageSize represents the records contained on one page. And the following involves specific examples, set the query page 2, each page contains 10 records.

Aug 06, 2021 am 09:22 AM

sql 分页

How to import sql files in sqlyog

How to import sql files in sqlyog: first open the sqlyog software; then find the [Import] option on the toolbar; finally select the ".sql" file to import.

Jul 15, 2021 pm 03:38 PM

sqlyog sql

What should I do if the SQL database cannot be connected?

Solution: 1. Check whether tcp/ip is enabled and pay attention to the port number; 2. Check the network problem; 3. Use the telnet command to check the port situation; 4. Check the server item and whether the username and password are correct; 5. Check whether the server Allow remote connections; 6. Start two authentication modes.

Jul 09, 2021 am 10:54 AM

sql 服务器

How to use PHP for database operations?

The previous article introduced you to "Advanced PHP Practice - What are the member attributes of the file upload class?" ", this article continues to introduce to you how to use PHP for database operations, which has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Jun 22, 2021 am 11:12 AM

PHP sql

What is the ole object in the database?

The ole object in the database is integrated with desktop applications, and also defines and implements a mechanism that allows applications to "connect" to each other as software "objects" (data collections and functions that manipulate data). This connection mechanism and protocol is called It is the Component Object Model, or COM for short.

Jun 03, 2021 pm 03:34 PM

数据库 ole

How to set up a lookup list in access

Setting method: First create a database, click the "Navigation Pane" icon button on the left side of the page; then select the specified data table, right-click the mouse, and select "Design View"; then select the specified field, and select "Lookup Wizard" for "Data Type"; Finally, click "Type the required value yourself", enter the specified type, and save the changes.

May 19, 2021 pm 03:16 PM

access 查阅列表

How to convert mdb files to excel

Conversion method: First open the file that needs to be operated and select the specified table; then right-click the mouse, select "Export" in the pop-up right-click menu, and click "Excel"; then select the specified file format in the pop-up "Export" menu and specify Name and specify the location; finally click the "Finish" button.

May 18, 2021 am 11:14 AM

mdb excel

What should I do if SQL cannot connect to the local server?

Method: First log in to the client, find "Instance Name Protocol", enable "Named Pipes" and "TCP/IP"; then start "SQL Server"; finally open "SSMS", select "Database Engine", "local)\Instance Name" and "Windows Authentication", click "Connect".

Apr 28, 2021 pm 05:16 PM

sql 本地服务器

How access establishes relationships between tables

Method: 1. Establish a database; 2. Click the "View" icon on the toolbar and select "Relationship" to open the window; 3. Select the added table in the "Add table to relationship" window and click "Add" to add the table. Go to the window, click "Close" after adding it to return to the relationship window; 4. Click the primary key in the table, make another table the same as it, and click "OK".

Apr 16, 2021 am 09:46 AM

access 表间关系

How to delete a row in sql

In SQL, you can delete a certain row of data through the DELETE method, using syntax such as "delete from ms_cf01 where brxm='Zhang San' and id='7598';", where "ms_cf01" indicates the table to which the data to be deleted belongs.

Apr 13, 2021 pm 03:43 PM

sql