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Technical Articles

Database

How to connect to MySQL using phpMyAdmin

EnsurephpMyAdminisinstalledandrunningonawebserverwithPHPandMySQL,accessibleviahttp://localhost/phpmyadminorhttp://yourdomain.com/phpmyadmin.2.LoginusingvalidMySQLcredentials(e.g.,usernamerootandpasswordifset).3.Troubleshootconnectionissuesbyverifying

Aug 07, 2025 am 09:08 AM

How to calculate the difference between two dates in MySQL?

To calculate the difference between two dates in MySQL, the function should be selected according to the required units: 1. Use DATEDIFF() to obtain the difference in the number of days. This function only compares the date part, and the result is the first date minus the second date; 2. Use TIMESTAMPDIFF() to obtain more accurate unit differences, such as hours, minutes, months or years. The function supports the time part and can specify the units; 3. Use TIMESTAMPDIFF() to calculate seconds or minutes and select the corresponding unit. Summary: If you only need the difference in the number of days, use DATEDIFF(), and use TIMESTAMPDIFF() if you need other units or time.

Aug 07, 2025 am 08:19 AM

What is an Oracle instance?

AnOracleinstanceisthein-memoryenvironmentconsistingofmemorystructuresandbackgroundprocessesthatenableaccesstoandmanagementofanOracledatabase.1)TheSystemGlobalArea(SGA)includesthedatabasebuffercache,redologbuffer,sharedpool,andotheroptionalmemorypools

Aug 07, 2025 am 07:38 AM

Oracle instance 數(shù)據(jù)庫實(shí)例

How to add comments to SQL queries?

There are two ways to write SQL comments: 1. Used for single-line comments -, suitable for explaining single-line code or temporary blocking code; 2. Used for multi-line comments /.../, suitable for explaining complex query logic. When using it, you should pay attention to concise comments, modify the code and update the comments simultaneously, and comment some codes during debugging. It is recommended to use standard writing methods to maintain universality.

Aug 07, 2025 am 07:30 AM

SQL Query Optimization Checklist for Developers

SQL query optimization is the key to improving system performance. 1. Ensure that the primary key, foreign key and high-frequency query fields have appropriate indexes, give priority to combined indexes and follow the principle of leftmost prefix; 2. Avoid using SELECT*, only necessary fields should be selected to reduce I/O and memory consumption; 3. Avoid LIMITOFFSET with large offsets during paging, and it is recommended to use cursor paging or combined index optimization; 4. Do not perform function operations on fields in the WHERE clause, and use scope query instead to utilize indexes; 5. Use EXPLAIN to analyze the execution plan, confirm the index usage and whether there are any problems such as full table scanning or temporary sorting.

Aug 07, 2025 am 07:26 AM

Redis vs Traditional DB: easy guide

Redisisbetterforhigh-speeddataaccessandreal-timeprocessing,whiletraditionaldatabasesaremoresuitableforcomplexqueryinganddataintegrity.1)Forperformance,chooseRedisifspeediscritical;otherwise,optfortraditionaldatabasesforcomplexqueries.2)Fordatapersist

Aug 07, 2025 am 07:22 AM

How to find all tables with a specific column name in MySQL

To find all tables containing specific column names, you need to query the INFORMATION_SCHEMA.COLUMNS table; 1. Use SELECT statement to retrieve TABLE_SCHEMA and TABLE_NAME; 2. Specify COLUMN_NAME='your_column_name' in the WHERE clause; 3. Optionally add ANDTABLE_SCHEMA='database_name' to limit the database scope; 4. Use BINARY to achieve case-sensitive matching; 5. Use LIKE for fuzzy search, such as COLUMN_NAMELIKE'?te%'; for example, find all tables with column names email,

Aug 07, 2025 am 07:17 AM

How do you handle transactions and locking in a multi-user SQL environment?

UseACID-complianttransactionstoensureatomicity,consistency,isolation,anddurabilitybywrappingrelatedDMLoperationsinexplicittransactionssuchasBEGINTRANSACTIONandCOMMITtopreventpartialupdates.2.Choosetheappropriateisolationlevel—ReadCommittedformostOLTP

Aug 07, 2025 am 07:13 AM

How to use INNER JOIN in MySQL

INNERJOINcombinesrowsfromtwoormoretablesbasedonarelatedcolumn,returningonlyrowswithmatchesinbothtables;2.ThebasicsyntaxisSELECTcolumnsFROMtable1INNERJOINtable2ONtable1.column=table2.column,wheretheONclausespecifiesthematchingcondition;3.Forexample,jo

Aug 07, 2025 am 07:09 AM

mysql

How can you monitor the status and progress of index builds in MongoDB?

You can view the index build status through the db.currentOp() command, and you can locate specific operations based on filtering conditions; the number of scanned documents and completion percentages of index builds will be recorded in the log; you can also use serverStatus and third-party monitoring tools to track progress. The specific methods are as follows: 1. Run db.currentOp() or add filter conditions to view the index operation, and the output includes operation type, namespace, index creation command and progress information; 2. View prompts like "ScannedNdocuments.N%completed" through MongoDB log to understand the construction progress; 3. Use db.serverStatus() to obtain system-level indicators, or use the help of

Aug 07, 2025 am 06:36 AM

How to check if a field exists in a hash using HEXISTS?

The HEXISTS command is used to check whether there is a specific field in the Redis hash, and returns 1 to indicate existence and 0 to indicate non-existence. Its syntax is HEXISTSkey_namefield_name, which is suitable for scenarios such as data verification, conditional logic and performance optimization. The operation complexity is O(1), which is efficient and stable, but it is only applicable to hash types. Pay attention to the difference between the use of other commands.

Aug 07, 2025 am 05:55 AM

What are MySQL Transactions and How to Use Them?

MySQLtransactionsensuredataintegritybytreatingmultipleSQLoperationsasasingleunitthateitherfullysucceedsorfails.1.StartatransactionusingSTARTTRANSACTIONorBEGIN.2.ExecuteSQLstatementslikeINSERT,UPDATE,orDELETE,whichremaintemporaryuntilcommitted.3.UseCO

Aug 07, 2025 am 05:42 AM

How do you manage different schemas in SQL?

Useschemastoseparatelogicalunitssuchasdepartments,environments,orapplicationmodulestoorganizedatabaseobjectsandavoidnamingconflicts.2.Controlaccessbygrantingordenyingpermissionsattheschemalevel,simplifyingsecuritymanagementandprotectingsensitivedata.

Aug 07, 2025 am 05:39 AM

sql Database schema

Does Redis Pub/Sub guarantee message delivery?

RedisPub/Subdoesnotguaranteemessagedeliverybecauseitonlysendsmessagestoactivesubscribersinrealtime.1.Messagesarelostifsubscribersdisconnect,areslow,orrestartduringpublishing.2.Itissuitablefornon-criticalusecaseslikelivechatbutnotforreliabledatatransf

Aug 07, 2025 am 05:31 AM

redis messaging