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Technical Articles

Database

How to use the AVG function in SQL

TheAVGfunctioninSQLcalculatestheaverageofanumericcolumnbysummingnon-NULLvaluesanddividingbytheircount,asshowninSELECTAVG(column_name)FROMtable_name;itignoresNULLsbydefault,canbegroupedwithGROUPBYtocomputeaveragespercategory,filteredwithHAVINGwhenused

Sep 04, 2025 am 04:26 AM

How to Secure Your MongoDB Database

Enabling authentication, restricting network access, enabling encryption and keeping updates are the core measures to protect MongoDB. First, enable authentication and use a strong password to create a user with minimal permission; secondly, restrict access through bindIp and firewall to avoid exposure to the public network; then enable TLS/SSL encryption to transmit data, and encrypt data at rest in combination with file system or MongoDB native functions; finally update the version regularly, enable audit logs and monitor abnormal behaviors to ensure database security.

Sep 04, 2025 am 04:10 AM

How to create a user in MySQL

Create a MySQL user first, first use the administrator account to log in, execute CREATEUSER to specify the user name, host and password, then give the corresponding permissions through the GRANT statement, and finally run FLUSHPRIVILEGES to take effect, 1. Connect to MySQL: mysql-uroot-p; 2. Create a user: CREATEUSER'username'@'host'IDENTIFIEDBY'password'; 3. Grant permissions: GRANTprivilege_typeONdatabase_name.table_nameTO'username'@'host'; 4. Refresh permissions: FLU

Sep 04, 2025 am 02:42 AM

How to get the last day of the month in SQL?

SQLServer uses the EOMONTH() function; 2.MySQL and Oracle use the LAST_DAY() function; 3.PostgreSQL is calculated by DATE_TRUNC plus interval; 4.SQLite uses the date function to combine string instructions; select the corresponding method according to different databases to accurately obtain the last day of the month.

Sep 04, 2025 am 02:27 AM

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