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Technical Articles

Database

How to reverse engineer a database in MySQL Workbench

OpenMySQLWorkbenchandconnecttothetargetdatabaseusingvalidcredentials.2.GotoDatabase>ReverseEngineertolaunchthewizard.3.Confirmorcreateaconnection,thenclickNext.4.Selecttheschema(s)toreverseengineerfromthelistandclickNext.5.Choosespecificdatabaseob

Aug 16, 2025 am 09:19 AM

What are the common use cases for the String data type in Redis?

Redis strings are widely used and are suitable for a variety of scenarios. 1. Can be used to cache static or computed data, such as API response, HTML fragments and database query results, store and obtain through SET and GET commands, and set expiration time with EX parameters to improve application performance and reduce database load; 2. Support atomic operations, suitable for use as speed limit and temporary counters, such as tracking login attempts, API call frequency, etc., and use INCR, DECR and other commands to avoid concurrency problems; 3. Suitable as a session storage solution for web applications, save serialized session data in the form of a string, supports fast read and write and automatic expiration, and is suitable for distributed architectures; 4. It can be used as a functional switch or a simple configuration item to dynamically control application behavior, such as

Aug 16, 2025 am 08:59 AM

redis string

Understanding SQL Execution Context and Permissions

SQL execution context refers to the identity or role when running SQL statements, which determine which resources and operation permissions can be accessed. Permission setting should follow the principle of minimum permissions, and common permissions include SELECT, INSERT, EXECUTE, etc. To troubleshoot permission issues, you need to confirm the login name, role permissions, EXECUTEAS settings and schema authorization. Performing context switching can be implemented through EXECUTEAS, but attention should be paid to user existence, permission granting and performance security impact. It is recommended to avoid arbitrarily assigning db_owner or sysadmin roles. The application account should only access necessary objects and be authorized through schema.

Aug 16, 2025 am 08:57 AM

sql Permissions

How to find duplicate emails in a customer table using SQL?

To find duplicate mailboxes in the customer table, you should use the GROUPBY and HAVING clauses; 1. Use SELECTemail, COUNT()FROMcustomersGROUPBYemailHAVINGCOUNT()>1 to identify duplicate mailboxes; 2. Use LOWER(email) to ensure case insensitive; 3. Use TRIM(LOWER(email)) to remove spaces and unify the format; 4. Optionally use GROUP_CONCAT or STRING_AGG to list the IDs of duplicate records; 5. Add WHEREemailISNOTNULL to exclude null values to ensure accurate and complete results.

Aug 16, 2025 am 08:44 AM

How to use the SUM function in SQL

TheSUMfunctioninSQLcalculatesthetotalofnumericvaluesinacolumn,ignoringNULLs;itisusedwithSELECT,optionallywithWHEREtofilterrows,GROUPBYtoaggregatebycategories,andHAVINGtofilteraggregatedresults,whileCOALESCEcanreplaceNULLvaluestoensureaccuratetotals,m

Aug 16, 2025 am 08:43 AM

How to copy a table structure in phpMyAdmin

TocopyatablestructureinphpMyAdminwithoutdata,useeithertheGUIorSQLmethod:1.IntheOperationstab,select"Structureonly"andspecifyanewnametocopythestructure;2.Alternatively,run"CREATETABLEnew_table_nameLIKEoriginal_table_name;"intheSQLt

Aug 16, 2025 am 07:58 AM

How to test SSH connection before connecting?

Use ssh-v to view the detailed connection process, and you can find connection stuttering stage, key problems or authentication failures; 2. Use nc-zv or nmap to check whether the SSH port is open and confirm the status of the network and firewall; 3. Use ssh-G to check the configuration file syntax errors to avoid connection failures due to spelling or path problems; 4. Simple test whether the target host is online through ping. Although it cannot fully represent SSH connectivity, it can be used as a preliminary reference. These methods can quickly troubleshoot common SSH problems before formal connection, saving troubleshooting time.

Aug 16, 2025 am 07:55 AM

What is the impact of using many small keys versus fewer large keys in a hash?

Using fewer large keys usually has more advantages in memory efficiency, reducing hash conflicts, and improving cache behavior, but depending on the usage scenario. 1. Less large keys can reduce the metadata overhead of each key-value pair, thereby saving memory; 2. Large keys reduce the possibility of hash conflicts and improve search speed; 3. Large keys improve cache locality due to centralized data storage and optimize CPU access efficiency; 4. Selecting strategies requires weighing the needs of fast search, memory usage and fine-grained control, and different scenarios require different processing.

Aug 16, 2025 am 07:41 AM

Hash 鍵大小

SQL Server Service Broker for Asynchronous Messaging

SQLServiceBroker is an asynchronous message processing framework built into the database engine, used for decoupling, reliable delivery and delay processing scenarios. 1. It is not an external component, but a communication mechanism integrated within SQLServer; 2. The core concepts include message type, contract, queue, service, session and routing; 3. The advantages lie in transaction consistency, message sequence and automatic retry mechanism; 4. It can be used to asynchronously handle email sending, report generation and other operations in the order system; 5. The usage process includes creating message types, contracts, queues, services, opening sessions and sending and receiving messages; 6. Notes include default disabling, manual session ending, performance tuning, debugging complexity, and highly available configuration.

Aug 16, 2025 am 07:38 AM

How does Redis's single-threaded architecture work?

Redisisfastdespitebeingsingle-threadedbecauseitavoidsmulti-threadingoverheadandusesnon-blockingI/Owitheventloops.1.Itprocessescommandsinasinglethreadtoeliminatelockingandcontext-switchingcosts.2.IthandleshightrafficviaaneventloopthatusesI/Omultiplexi

Aug 16, 2025 am 07:10 AM

How to add a foreign key in phpMyAdmin

ToaddaforeignkeyinphpMyAdmin,firstensurebothtablesuseInnoDB,thereferencedcolumnisindexedandhasamatchingdatatype.1.OpenthechildtableinphpMyAdmin.2.GototheStructuretabandclick"Relationview".3.Selectthereferencedtableandcolumnfromthedropdown,s

Aug 16, 2025 am 06:33 AM

How to create a table from a SELECT statement in SQL

YoucancreateatablefromaSELECTstatementusingCREATETABLEASSELECT(CTAS)inmostdatabases,orSELECTINTOinSQLServer;forexample,PostgreSQL,MySQL,Oracle,andSQLiteuseCREATETABLEnew_tableASSELECT...togenerateanewtablewithdataandstructurefromthequery,whileSQLServ

Aug 16, 2025 am 06:18 AM

sql Create table

How to use MySQL Workbench for database design and administration?

Design a database using MySQLWorkbench: After opening the tool, create a new model, double-click the physical mode, build an EER chart by dragging the table to the canvas and defining columns, primary keys, indexes and foreign keys, use relationships to connect the table and forwardly generate SQL or export charts; 2. Connect and manage MySQL server: Add a connection to the homepage, enter a name, host, port, user name and password, test the connection and log in, you can browse table data, execute SQL, view performance charts and manage user permissions; 3. Perform daily management tasks: create users and assign permissions through user and permission functions, use data export/import for backup and recovery, view server logs, processes and status variables, and use performance dashboard to analyze query and generate reports; 4.

Aug 16, 2025 am 05:40 AM

What scripting languages does Navicat support for automation?

NavicatsupportsautomationthroughJavaScript,Python,andVBScript.1.JavaScriptisnativelysupported,especiallyinpremiumeditions,enablingdirectdatabaseinteraction,logic-baseddatamanipulation,andscheduledtasks.2.Pythonintegrationisachievedexternally,allowing

Aug 16, 2025 am 04:18 AM