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Technical Articles

Database

How to revoke privileges from a user in MySQL

TorevokeprivilegesfromauserinMySQL,usetheREVOKEstatement;1.Specifytheprivilegetype(e.g.,SELECT,INSERT,ALLPRIVILEGES);2.Definethescopeusingdatabase_name.table_name(e.g.,mydb.usersormydb.*);3.Identifytheexact'username'@'host'account;4.OptionallyrevokeG

Aug 11, 2025 pm 06:34 PM

SQL Server Agent Jobs for Automation

To create a basic SQLServerAgent job, 1. Open SSMS, connect to the database instance, expand SQLServerAgent, right-click Jobs, and select New job; 2. Fill in the name and description on the "General" page; 3. Add T-SQL or CmdExec and other execution steps on the "Step" page; 4. Set the execution frequency on the "Scheduling" page, such as daily, weekly, or custom cycles; 5. Test the job logic to ensure there is no syntax and permissions problem; 6. Set the failure notification method, such as email, event log or alarm, and decide whether to continue to execute the next step after failure; at the same time, pay attention to details such as server time, job owner permissions, step type selection, and output log path.

Aug 11, 2025 pm 06:17 PM

How to get the first and last day of the year in SQL?

ThefirstdayoftheyearisobtainedbyconstructingortruncatingtoJanuary1stofthegivenyear,andthelastdayisDecember31stofthesameyear,withmethodsvaryingbydatabasesystem;2.Fordynamiccurrentyeardates,MySQLusesDATE_FORMATorMAKEDATE,PostgreSQLusesDATE_TRUNCorDATE_

Aug 11, 2025 pm 05:42 PM

sql date

What is the character set and collation in MySQL?

Acharactersetdefineswhichcharacterscanbestored,whileacollationdetermineshowtheyarecomparedandsorted.1.Charactersetslikeutf8mb4supportfullUnicode,includingemojisandinternationalcharacters.2.Collationssuchasutf8mb4_0900_ai_ciproviderulesforcase-insensi

Aug 11, 2025 pm 05:22 PM

mysql character set

How to find the intersection of two tables in SQL?

UsetheINTERSECToperatorifsupported(e.g.,PostgreSQL,SQLServer,Oracle)todirectlyreturnuniquerowspresentinbothtableswithmatchingcolumnsandautomaticduplicateremoval.2.SimulateINTERSECTusingINNERJOINbyexplicitlycomparingallrelevantcolumnsandwrappingwithDI

Aug 11, 2025 pm 05:16 PM

How to get the row count for all tables in a database in SQL?

ForSQLServer,usesys.dm_db_partition_statstogetaccuraterowcountsfrommetadatawithoutscanningtables.2.ForMySQL,queryinformation_schema.TABLESforestimatedrowcounts,butuseCOUNT()pertableforexactnumbers.3.ForPostgreSQL,usepg_stat_user_tablesforestimatedcou

Aug 11, 2025 pm 04:50 PM

sql Row count

How to check the execution plan of a query in Oracle

UseEXPLAINPLANFORtogenerateanestimatedexecutionplanwithoutrunningthequery,thenqueryDBMS_XPLAN.DISPLAYtoviewitinreadableformat.2.EnableAutotraceinSQL*PlusorSQLDeveloperwithSETAUTOTRACEONtoseeboththeexecutionplanandruntimestatisticsafterqueryexecution.

Aug 11, 2025 pm 04:37 PM

oracle Implementation plan

How to work with XML data in SQL

StoreXMLinXML-typecolumnsandquerywithXQuerymethods:use.value()toextractscalars,.query()forXMLfragments,.nodes()toshredintorows,and.exist()forconditionalfiltering;2.ModifyXMLusing.modify()inSQLServerwithXQueryDMLforinsertionsordeletions;3.GenerateXMLf

Aug 11, 2025 pm 04:28 PM

xml sql

How to migrate from SQL Server to MySQL

First, clear the answer: Migrating from SQLServer to MySQL requires evaluation, transformation, migration, testing and adjustment in steps. 1. Evaluate the source database, inventory the objects and identify dependency and incompatibility characteristics; 2. Map the data type differences, such as INTIDENTITY to INTAUTO_INCREMENT, NVARCHAR to VARCHAR and set the utf8mb4 character set, DATETIME maintains the corresponding, BIT to TINYINT(1), UNIQUEIDENTIFIER to CHAR(36) or BINARY(16); 3. Through the MySQLWorkbench migration wizard, manual export import or third-party tools such as AWSDMS

Aug 11, 2025 pm 04:09 PM

How to use the WHERE clause in MySQL

TheWHEREclauseinMySQLfiltersrecordsbasedonspecifiedconditions.1.ItisusedinSELECT,UPDATE,andDELETEstatementstoaffectonlymatchingrows.2.Comparisonoperatorslike=,!=,,=allowprecisefiltering.3.LogicaloperatorsAND,OR,andNOTcombinemultipleconditions,requiri

Aug 11, 2025 pm 03:54 PM

How to remove duplicate rows in SQL?

UseSELECTDISTINCTtoretrieveuniquerowswithoutmodifyingthetable.2.UseROW_NUMBER()withaCTEtoidentifyduplicatesanddeleterowswithrn>1,keepingthefirstrowbasedonaspecifiedorder.3.CreateatemporarytablewithDISTINCTdata,droptheoriginal,andrenamethecleantabl

Aug 11, 2025 pm 03:51 PM

How to search for special characters like '%' or '_' in SQL?

To search for special characters such as % or _ in SQL, they must be escaped using ESCAPE clause or parentheses. 1. Use ESCAPE keyword to define escape characters, such as SELECT*FROMtable_nameWHEREcolumnnameLIKE'%\%%'ESCAPE'\', where \% represents the literal %; 2. Other escape characters such as!, such as LIKE'%!%%'ESCAPE'!'; 3. In SQLServer and PostgreSQL, you can enclose special characters, such as LIKE'%[%]%' or LIKE'%[]%', so that they match literally; 4. MySQL supports ESCAPE and allows customization.

Aug 11, 2025 pm 03:21 PM

Analyzing Logs and Metrics for a Healthy MongoDB Environment

Monitorkeyperformancemetricssuchasoperationlatency,queuelength,memoryusage,connectioncount,replicationlag,anddiskI/Otodetectbottlenecksandsystemstress.2.AnalyzeMongoDBlogsforslowqueries,replicationissues,storagewarnings,andauthenticationfailuresusing

Aug 11, 2025 pm 03:15 PM

How to use the CONVERT function in SQL?

The CONVERT function is used to convert the data type of an expression to another type in SQL, mainly used in SQLServer and MySQL, but the syntax is different. 1. In SQLServer, the syntax is CONVERT(data_type[(length)],expression,[style]), where data_type is the target type, length is the optional length, expression is the value to be converted, and style is the date format code; for example: CONVERT(DATETIME,'2023-10-01') converts the string to a date, CONVERT(VARCHAR(10),

Aug 11, 2025 pm 03:12 PM