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Technical Articles

Database

How to install phpMyAdmin using Docker

First, make sure to install Docker and DockerCompose, then use docker-compose.yml to configure MySQL and phpMyAdmin services, then start the container through docker-composeup-d, and finally access http://localhost:8080 in the browser and log in with the root account and set password to complete the installation and access of phpMyAdmin. It is recommended to create a dedicated user and restrict port exposure to improve security.

Sep 06, 2025 am 02:01 AM

docker

How to use the COUNT function in SQL

COUNT(*) returns the total number of rows in the table, regardless of whether there is a NULL value; COUNT(column_name) only calculates the number of non-NULL values ??in the specified column; COUNT(DISTINCTcolumn_name) calculates the number of unique non-NULL values ??in the column; combined with the WHERE clause, conditional counting can be achieved, and GROUPBY can be used to count by group and filter the results with HAVING. Correct selection of COUNT form and avoid common errors can effectively improve the accuracy of data query and ultimately achieve efficient data analysis.

Sep 06, 2025 am 01:03 AM

How to Optimize Aggregation Pipelines in MongoDB

Filterdataearlyusing$matchand$projecttoreducedocumentvolumeandsize.2.Use$limitand$sortefficientlywithindexesandtop-ksorting.3.Optimize$lookupbyfilteringinsidethepipelineandindexingforeignfields.4.LeverageindexesandexplainplanstominimizeCOLLSCANandavo

Sep 06, 2025 am 12:34 AM

What are the different types of joins in Oracle?

ThemaintypesofjoinsinOracleare:1.INNERJOINreturnsonlymatchingrowsfrombothtables;2.LEFTJOINreturnsallrowsfromthelefttableandmatchedrowsfromtheright,withNULLsforunmatchedright-sidecolumns;3.RIGHTJOINreturnsallrowsfromtherighttableandmatchedrowsfromthel

Sep 05, 2025 am 08:17 AM

How to use prepared statements in MySQL

Using preprocessing statements can effectively prevent SQL injection and improve performance. The answer is to separate SQL structure and data to achieve safe and efficient query execution. 1. In MySQL native commands, use PREPARE, SET, EXECUTE and DEALLOCATE statements to define and execute preprocessing statements, such as PREPAREstmt_nameFROM'SELECT*FROMusersWHEREid=?'; 2. In PHP's MySQLi, use prepare() to create a statement, bind_param() to bind parameters, execute() to execute, and finally close the statement; 3. In PHP's PDO, support naming placeholders such as:id,

Sep 05, 2025 am 08:04 AM

How to find the mode (most frequent value) in SQL?

TofindthemodeinSQL,firstgroupbythecolumnandcountthefrequencyofeachvalue.2.Then,identifythemaximumfrequencyusingasubqueryorwindowfunctiontofilterforthemostfrequentvalue(s).3.UseasubqueryapproachforcompatibilityacrossallSQLdialectsorwindowfunctionslike

Sep 05, 2025 am 07:41 AM

How to find all tables with a specific column name in SQL?

To find all tables containing specific column names, it can be done by querying the system metadata table, the most common method is to use INFORMATION_SCHEMA.COLUMNS. 1. In standard SQL, execute SELECTTABLE_NAMEFROMINFORMATION_SCHEMA.COLUMNSWHERECOLUMN_NAME='your_column_name' to return all table names in the specified column. If you need to define a specific schema or database, you can add the TABLE_SCHEMA or TABLE_CATALOG conditions. 2. In SQLServer, you can use sys.columns and sys.ta

Sep 05, 2025 am 07:13 AM

sql 查找表

How to force a query to use a specific index in MySQL

USEINDEXsuggestsanindexbutallowsMySQLtoignoreitifatablescanisbetter;2.FORCEINDEXrequirestheuseofaspecificindexandpreventstablescans,whichcanimproveperformancewhentheoptimizermakespoorchoicesbutmaydegradeperformanceifmisused;3.IGNOREINDEXpreventsMySQL

Sep 05, 2025 am 06:53 AM

How to Ensure Durability of Writes in MongoDB

ToensuredurablewritesinMongoDB,usewriteconcernw:"majority"toconfirmwritesonamajorityofreplicasetmembers,enablejournaling(storage.journal.enabled:true)toprotectagainstcrashes,anddeployaproperlyconfiguredthree-memberreplicasetforfaulttoleranc

Sep 05, 2025 am 06:52 AM

mongodb Data persistence

How to Use MongoDB for E-commerce Applications

MongoDBisidealfore-commerceduetoitsflexibledocumentmodel,enablingefficientproductcatalogmanagementwithschema-freeJSON-likedocuments;itsupportsembeddeddataandarraysforproductvariants,specifications,andimages,whileindexingenhancesqueryperformanceonfiel

Sep 05, 2025 am 06:46 AM

mongodb e-commerce

How to insert data into a table with an identity column in SQL

ToinsertdataintoaSQLServertablewithanidentitycolumn,omittheidentitycolumnintheINSERTstatementforautomaticvaluegeneration,oruseSETIDENTITY_INSERTONtotemporarilyallowexplicitvalues,insertthedesireddataincludingtheidentityvalue,thenturnitoffwithSETIDENT

Sep 05, 2025 am 06:37 AM

How to improve SQL query performance?

UseindexeseffectivelybycreatingthemonWHERE,JOIN,ORDERBY,andGROUPBYcolumns,usingcompositeindexesformulti-columnfilters,andavoidingover-indexingtoreducewriteoverhead.2.Optimizequerystructurebyselectingonlyneededcolumns,avoidingfunctionsonindexedcolumns

Sep 05, 2025 am 06:15 AM

Query optimization sql performance

How to copy a database in phpMyAdmin

TocopyadatabaseinphpMyAdmin,firstcheckifthe"CopyDatabaseto"featureisavailableundertheOperationstab,selectthesourcedatabase,enterthenewdatabasename,choose"Structureanddata"withCREATE/DROPoptions,andclickGo.2.Ifthatoptionisunavailab

Sep 05, 2025 am 05:50 AM

How to rebuild an index in Oracle

UseALTERINDEXindex_nameREBUILDtorebuildanindex,whichcreatesanewcompactversionandreplacestheoldone;2.Optionallyspecifystorageparametersliketablespaceorblocksizeduringrebuild;3.UseALTERINDEXindex_nameREBUILDONLINEtoallowconcurrentDMLoperations,thoughit

Sep 05, 2025 am 05:41 AM

oracle 索引重建