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Technical Articles

Database

How to set up an alias for phpMyAdmin in Nginx

To set the Nginx alias of phpMyAdmin, first make sure that its installation path is correct, and the common path is /usr/share/phpmyadmin/; then add the location/admin block in the server block of the Nginx configuration file, use alias to point to the phpMyAdmin directory, and configure nested location blocks for the PHP file, explicitly set fastcgi_pass and SCRIPT_FILENAME; then test and overload the Nginx configuration; finally access through http://your-domain.com/admin, optionally add IP restriction or HTTP authentication to enhance security. 1. Confirm

Sep 03, 2025 am 01:41 AM

nginx

How to analyze a query execution plan in SQL

Toanalyzeaqueryexecutionplaneffectively,startbyunderstandingthatitrevealshowthedatabaseexecutesaquery,includingoperationslikescans,seeks,joins,andsorts;usetoolslikeSQLServerManagementStudio,EXPLAINinPostgreSQL,orEXPLAINPLANinOracletoviewestimatedorac

Sep 03, 2025 am 01:31 AM

How to join multiple tables in SQL

To join multiple tables, you need to use multiple JOIN operations in the FROM clause and specify the association conditions. For example, connect three or more tables in sequence based on foreign key relationships through INNERJOIN or LEFTJOIN to ensure that each JOIN has a clear ON condition to avoid Cartesian product. At the same time, use table alias to improve readability, and ultimately achieve cross-table data integration. This method can be extended to any number of association tables, and the desired result can be correctly returned as long as the logic is clear and the connection order is reasonable.

Sep 03, 2025 am 01:23 AM

How to Securely Connect to a Remote MongoDB Instance

SecureremoteMongoDBaccessrequiresenablingauthenticationwithstrongcredentials,configuringTLS/SSLencryptionfordataintransit,restrictingnetworkaccessviafirewallsandbindIPsettings,andusingSSHtunnelingorVPNstopreventpublicexposure,ensuringprotectionagains

Sep 03, 2025 am 01:20 AM

How to insert if not exists in MySQL (UPSERT)

UseINSERTIGNOREtoinsertarowonlyifitdoesn'texist,silentlyskippingduplicatesbasedonauniqueconstraint;2.UseINSERT...ONDUPLICATEKEYUPDATEtoupsert,insertingifnotexistsorupdatingifitdoes;3.AvoidREPLACEINTOasitdeletesandreinserts,potentiallycausingdatalosso

Sep 03, 2025 am 12:47 AM

mysql Upsert

How to import connection settings?

The key to importing connection settings is to confirm whether the software supports import function and choose the appropriate method according to the situation. First, check whether there is an "import" option in the settings or preferences of the software, or check the official documents to confirm whether import is supported; second, if the software supports the export function, you can first export the configuration file and load the file through the import option on the new device, which is suitable for tools such as DBeaver and Termius; finally, if there is no clear import and export option, you can manually copy the configuration file to the corresponding path of the target device, pay attention to version compatibility and back up the original configuration before operation.

Sep 03, 2025 am 12:45 AM

How to perform a boolean full-text search in MySQL

To perform Boolean full text search, you must first create a FULLTEXT index, and then use MATCH()...AGAINST() with INBOOLEANMODE and Boolean operators; 1. Make sure that FULLTEXT index has been created for the search column, which can be implemented through ALTERTABLE or CREATETABLE; 2. Use MATCH()...AGAINST('searchterms'INBOOLEANMODE) syntax to perform searches; 3. Use (must include), - (must exclude), "(exact phrase), * (prefix wildcard), () (group), ~ (optional downright) and other operators to accurately control the results; 4

Sep 03, 2025 am 12:26 AM

How does Pub/Sub compare to Redis Streams for messaging?

The choice of Pub/Sub or RedisStreams depends on the usage scenario. 1. If message persistence and replay is required, RedisStreams should be selected, which supports message storage and recovery; 2. If consumer groups need to implement distributed processing, RedisStreams provides built-in support; 3. If low latency is pursued and message loss can be tolerated, Pub/Sub is lighter and more efficient; 4. If you need to ensure reliable message delivery and structured consumption, RedisStreams is a better choice. Both have their own trade-offs and are determined based on application needs.

Sep 03, 2025 am 12:23 AM

pub/sub

What is Redis and How Does It Differ From Relational Databases?

Redisisanin-memorydatastructurestoreusedasadatabase,cache,andmessagebroker,excellinginspeedandflexibility.1)Itoperatesinmemoryforfasterread/writeoperations,idealforlow-latencyscenarioslikecachingandreal-timeanalytics.2)Redissupportsvariousdatastructu

Sep 03, 2025 am 12:20 AM

How to delete duplicate records from a table in Oracle

TodeleteduplicaterecordsinOracle,useROWIDtouniquelyidentifyrowsandremoveduplicateswhilekeepingonecopy.2.First,identifyduplicatesbygroupingonkeycolumnslikeemailandnameandusingHAVINGCOUNT(*)>1tofindrepeatedcombinations.3.Deleteduplicateswiththequery

Sep 02, 2025 am 09:40 AM

How to generate an AWR report in Oracle

ConnecttothedatabaseusingSQL*Plusasaprivilegeduser(e.g.,SYSDBA).2.Runthescript@$ORACLE_HOME/rdbms/admin/awrrpt.sqltostartAWRreportgeneration.3.Choosethereporttype(textorHTML).4.Enterthenumberofdaystodisplayavailablesnapshots.5.Specifythebeginandendsn

Sep 02, 2025 am 09:38 AM

How to get the current date and time in MySQL?

To get the current date and time, you should use the NOW() function because it returns the date and time when the statement starts to execute; if it needs to be precise to the time of the function execution moment, use SYSDATE(); use CURDATE() when only the date is needed, and use CURTIME() when only the time is needed; these functions can be used to query, insert or set default values, such as CREATETABLElogs(idINTPRIMARYKEY, messageTEXT, created_atDATETIMEDEFAULTNOW());, NOW() is usually recommended unless the real-time feature of SYSDATE() is required.

Sep 02, 2025 am 08:27 AM

How to use the modulo operator in SQL

ThemodulooperatorinSQLreturnstheremainderofadivisionandisusedforfiltering,grouping,oridentifyingpatternsinnumericdata;itissupportedacrossdatabaseswithvaryingsyntax—MySQL,PostgreSQL,SQLite,andOracle(10g )usethe%operator,whileSQLServerandolderOraclever

Sep 02, 2025 am 08:22 AM

What is the CAST() function in SQL and how do you use it?

The CAST() function is used to convert values ??from one data type to another to ensure the data is formatted correctly. 1. Convert the string to integer: SELECTCAST('123'ASINT) 456; 2. Convert the string to date: SELECTCAST('2023-04-01'ASDATE); 3. Convert the number to string: SELECT'Order#' CAST(order_idASVARCHAR(10)); 4. Convert the decimal: SELECTCAST('99.99'ASDECIMAL(5,2)). Note that invalid conversion will report an error. Different databases have good compatibility, but may affect index performance. You can use TRY_

Sep 02, 2025 am 08:18 AM