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Home

Technical Articles

Database

How to view server status in phpMyAdmin

AccesstheStatustabinphpMyAdminfromthetopmenutoviewserverstatus.2.ReviewkeymetricsundercategorieslikeLoad,Connections,Traffic,QueryStatistics,Tables,Buffers&Memory,andInnoDBStatusforreal-timeperformanceinsights.3.EnabletheLiverefreshfeatureormanua

Sep 04, 2025 am 02:25 AM

How to analyze table statistics in Navicat?

Analyzing table statistics in Navicat can be achieved through graphical interfaces and SQL queries. First, open the database connection and find the target table, right-click "Table Designer" or "Object Information", and view basic information such as row count, data size, index size and other information in the "Statistics" tab; secondly, switch to the "Index" tab to view the selectivity and cardinality of the index, PostgreSQL users can also execute the SQL query pg_stats view to obtain relevant information; finally, you can update statistical information by right-clicking the table to select "Analysis Table" or "Maintenance Table" to improve query performance. In addition, users can directly run SQL languages ??such as SHOWTABLESTATUS or SELECTrelpages, reltuples and other SQL languages

Sep 04, 2025 am 01:37 AM

How to use common table expressions for readability in SQL?

Using CTE can significantly improve the readability and maintainability of SQL queries. 1. Decompose complex queries into logical parts with names to improve clarity; 2. Use meaningful names such as active_users or top_products to clearly express the intention; 3. Build query logic in steps through chained CTEs. The previous CTE can be referenced by subsequent CTEs; 4. Keep each CTE single responsibilities and organize them in the order of filtering, aggregation, and connections to avoid excessive nesting; 5. Note that CTEs are mainly used to enhance readability rather than performance optimization, and subqueries may be more appropriate in simple scenarios. Ultimately, it makes SQL as easy to understand and maintain as programming code.

Sep 04, 2025 am 12:51 AM

sql CTE

How to upgrade an Oracle database

Checkcompatibility,reviewupgradepath,backupalldataandrunthepre-upgradetool.2.Fixdeprecatedparameters,gatherdictionarystatistics,resolveinvalidobjectsandensuresufficientspace.3.UpgradeusingDBUAormanuallybystartinginUPGRADEmodeandrunningcatctl.pl.4.Ver

Sep 04, 2025 am 12:29 AM

How to drop a database in phpMyAdmin

LogintophpMyAdminviayourbrowser.2.Selectthetargetdatabasefromtheleft-handsidebar.3.Clickthe"Operations"tabatthetop.4.Scrollto"Removedatabase(DROP)"andclick"Drop",thenconfirmtheaction.Alternatively,usetheSQLtabandrunDROPD

Sep 04, 2025 am 12:23 AM

How to perform database maintenance tasks in Navicat?

Database maintenance can be efficiently managed through Navicat, including: 1. Regular backup and restore databases, operation through the "Backup" and "Restore Backup" functions and retain multiple versions; 2. After cleaning useless data, optimize tables to improve performance, and process them one by one to avoid high load; 3. Use "checklist" and "repair tables" to deal with corruption, and temporary backups are recommended before operation; 4. Update statistical information to ensure accurate query optimization through the "Analysis Table" function.

Sep 04, 2025 am 12:17 AM

navicat database maintenance

How to select a database in MySQL

UsetheUSEdatabase_name;commandtoselectadatabaseinMySQL,replacingdatabase_namewiththedesireddatabase.2.ListavailabledatabaseswithSHOWDATABASES;ifunsurewhichonesexist.3.VerifythecurrentlyselecteddatabaseusingSELECTDATABASE();whichreturnstheactivedataba

Sep 04, 2025 am 12:06 AM

What is partitioning in Oracle?

PartitioninginOracleimprovesperformance,manageability,andavailabilityforlargetablesbydividingthemintosmaller,physicalsegmentswhileappearingasasingleobject.1.RangePartitioningsplitsdatabasedonvalueranges,idealfortime-seriesdatalikesales.2.ListPartitio

Sep 03, 2025 am 08:59 AM

How to extract the year from a date in SQL

To extract the year from dates in SQL, the function should be selected according to the database system: use the YEAR() function in MySQL, SQLServer and MariaDB, such as SELECTYEAR('2025-04-05') to return 2025; in PostgreSQL, the EXTRACT(YEARFROM...) syntax of standard SQL should be used, such as SELECTEXTRACT(YEARFROM'2025-04-05'::date) to return 2025. This method is also applicable to Oracle and has cross-database portability; PostgreSQL also supports DATE_PART('year',date) for

Sep 03, 2025 am 07:23 AM

sql 提取年份

How to find unused indexes in Oracle

EnablemonitoringwithALTERINDEXschema.index_nameMONITORINGUSAGE;2.Runnormalworkloadforarepresentativeperiod;3.CheckV$OBJECT_USAGEforUSED='NO'toidentifyunusedindexes;4.DisablemonitoringviaALTERINDEXschema.index_nameNOMONITORINGUSAGE;5.SupplementwithDBA

Sep 03, 2025 am 07:19 AM

How to convert a string to uppercase or lowercase in MySQL

ToconvertastringtouppercaseorlowercaseinMySQL,usetheUPPER()andLOWER()functions.1.UseUPPER(str)toconvertastringtouppercase,e.g.,SELECTUPPER('helloworld')returnsHELLOWORLD,orapplyittoacolumnlikeSELECTUPPER(name)FROMusers.2.UseLOWER(str)toconvertastring

Sep 03, 2025 am 07:01 AM

mysql String conversion

What is the OPTIMIZE TABLE command in MySQL?

OPTIMIZETABLEisusedtoreorganizephysicalstorageandreclaimunusedspaceafterlargedeletionsorupdates,particularlyinInnoDBandMyISAMtables;itrebuildsthetablebycopyingonlylivedata,defragmentsstorage,updatesindexstatistics,resetsauto-incrementcountersinsomeca

Sep 03, 2025 am 05:54 AM

How to use the PIVOT operator with dynamic columns in SQL?

To implement dynamic PIVOT operation of unknown column values ??in SQLServer, dynamic SQL must be used. The specific steps are as follows: 1. Recognize that standard PIVOT needs to hardcode column values ??and cannot adapt to dynamically changing categories; 2. Construct dynamic column lists by querying DISTINCT values, and use QUOTENAME() to safely process column names; 3. Splice the generated column names into PIVOT query strings and execute them with EXECsp_executesql; 4. The generated SQL statements can be debugged through PRINT@SQL; this method is suitable for scenarios where column values ??change over time, such as dynamically generating columns by product, month or region, and finally implement flexible and complete dynamic cross-reports, ending with a complete sentence structure.

Sep 03, 2025 am 05:47 AM

How to extract the day from a date in SQL

ToextractthedayfromadateinSQL,useDAY()orEXTRACT(DAYFROM...)dependingonthedatabase:MySQLsupportsbothDAY()andEXTRACT(),PostgreSQLandOracleuseEXTRACT(),SQLServerallowsDAY()orDATEPART(day,...),andSQLiterequiresstrftime('%d',...)whichreturnsazero-paddedst

Sep 03, 2025 am 05:22 AM

sql date