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Technical Articles

Database

phpMyAdmin empty a table (truncate)

ToemptyatableinphpMyAdminwhilekeepingitsstructure,usetheTRUNCATEcommandviathe"Empty"buttonorSQLtab:1.LogintophpMyAdmin.2.Selectthedatabaseandtable.3.Clickthe"Operations"tabandusethe"Empty"button,orgotothe"SQL"t

Aug 30, 2025 am 02:44 AM

What command-line options are available for Navicat?

Navicatsupportscommand-lineoperationsforautomationandscripting.1.Basicstructureusesnavicat[options]withOS-specificpaths.2.Commonoptionsinclude--open=,--new,--import=,--export=,and--query=forspecifictasks.3.ExecutionvariesslightlyacrossWindows,macOS,a

Aug 30, 2025 am 02:27 AM

navicat 命令行選項(xiàng)

How to optimize COUNT(*) for large tables in MySQL?

UseapproximatecountsfromSHOWTABLESTATUSorEXPLAINwhenprecisionisn’tneeded,astheyprovidefastestimateswithoutfullscans.2.Maintainacountertableupdatedviatriggersorapplicationlogicforexactcounts,enablinginstantretrieval.3.CachecountresultsinRedisortheappl

Aug 30, 2025 am 01:50 AM

How to find the longest and shortest string in a column in SQL?

Tofindthelongestandshorteststringlengths,useMAX(LENGTH(column_name))andMIN(LENGTH(column_name))inSQL,orMAX(LEN())andMIN(LEN())inSQLServer.2.Toretrievetheactuallongestandshorteststrings,useORDERBYLENGTH(column_name)DESCLIMIT1forthelongestandORDERBYLEN

Aug 30, 2025 am 01:39 AM

What is the CONCAT_WS() function in MySQL?

CONCAT_WS()inMySQLconcatenatesstringswithaspecifiedseparator,ignoringNULLvalueswhileapplyingtheseparatoronlybetweennon-NULLvalues;1.Thefunctionusesaseparator(e.g.,',','-')placedbetweeneachpairofnon-NULLarguments;2.IftheseparatorisNULL,theentireresult

Aug 30, 2025 am 01:35 AM

How to delete a table in phpMyAdmin

LogintophpMyAdminusingyourcredentials.2.Selectthetargetdatabasefromtheleft-handsidebar.3.Locateandselectthetableyouwanttodelete.4.Deletethetableeitherbycheckingtheboxandselecting"Drop"fromthe"Withselected"dropdown,orbyclickingthe&

Aug 30, 2025 am 12:59 AM

How to handle errors in MySQL stored procedures?

Use the DECLAREHANDLER statement to effectively handle errors in MySQL stored procedures, and to deal with exceptions such as SQLEXCEPTION by defining a processor of CONTINUE or EXIT type. Combined with GETDIAGNOSTICS to obtain error details, and use transactions and OUT parameters to ensure the integrity of operations and the accuracy of feedback, thereby improving the robustness of database applications.

Aug 30, 2025 am 12:50 AM

mysql stored procedure

How to merge two rows into one in SQL?

To merge two rows of data, you need to select methods according to the specific scenario: 1. If you merge rows according to the same ID, use GROUPBY to combine SUM, STRING_AGG and other aggregate functions to merge multiple row values ??into one row; 2. If you need to merge two specific rows (such as login/logout records), you can combine MAX and GROUPBY through CASE statements to realize row conversion; 3. If there is an association relationship between the two rows (such as employee and manager), use self-connection (SELF-JOIN) to merge the two rows into one row; 4. If you need to merge multiple rows of text into a single column string, you can use functions such as STRING_AGG (PostgreSQL), GROUP_CONCAT (MySQL) and other functions. The syntax of different databases is slightly different, so

Aug 30, 2025 am 12:49 AM

SQL Optimistic vs. Pessimistic Concurrency Control

Pessimistic concurrency control is suitable for scenarios with frequent write operations and high conflict probability, such as bank transfer systems, which avoid conflicts by adding locks; optimistic concurrency control is suitable for scenarios with more reads, fewer writes and fewer conflicts, such as e-commerce systems browsing products and detecting conflicts through version numbers. The choice of the two depends on the business scenario: 1. Pessimistic locks are preferred for high-conflict scenarios, pay attention to lock granularity and deadlock issues; 2. Optimistic locks are used in low-conflict scenarios to improve concurrency performance; 3. It can be mixed according to the business module, with pessimistic locks used for critical paths, and optimistic locks used for non-critical paths.

Aug 30, 2025 am 12:39 AM

How to clone a database in MySQL

Usemysqldumptoexportandimportthedatabaseforareliable,fullclone;2.UseCREATETABLE...LIKEandINSERTforcloningspecifictablesmanually;3.UseMySQLWorkbenchorphpMyAdminforaGUI-basedclone;4.Ensureproperpermissions,sufficientstorage,andhandleforeignkeysandlarge

Aug 30, 2025 am 12:28 AM

Could not connect to server Navicat: what if I have a local server?

To resolve the "Couldnotconnecttoserver" error when Navicat connects to the local server, you can follow the following steps: 1. Confirm the server's running status, use commands such as "sudoservicemysqlstatus" to check, and start the server if necessary; 2. Check the server configuration file (such as MySQL's my.cnf) to ensure that the bind-address is set correctly; 3. Adjust the firewall settings, temporarily disable the firewall or ensure that the server port is open; 4. Verify the connection configuration of Navicat, including the host name, port, user name and password. With these steps, you can effectively resolve connection issues.

Aug 30, 2025 am 12:12 AM

How to create a SPFILE from a PFILE in Oracle

TocreateanSPFILEfromaPFILE,firstensureavalidPFILEexistsinthedefaultlocationorspecifyacustompath.2.ConnecttothedatabaseusingSQL*PluswithSYSDBAprivilegesviasqlplus/assysdba.3.RunCREATESPFILEFROMPFILE;togeneratetheSPFILEfromthePFILEusingdefaultpaths,ors

Aug 29, 2025 am 08:32 AM

How to use LEAD and LAG functions in SQL?

LEAD and LAG functions are used to access the data of the previous or next row in the result set without self-concatenation; 1. LAG (column,offset,default) gets the value of the previous row, offset specifies the number of traceback rows, default is 1, default is the default value when there is no previous value; 2. LEAD (column,offset,default) gets the value of the subsequent row, the parameters are the same as LAG; 3. Both must be used in conjunction with the OVER() clause, ORDERBY defines the row order, and optional PARTITIONBY can be partitioned by group; 4. In the example, the difference between daily sales and previous days is compared by LAG and LEAD; 5. The offset and default can be set to process edges.

Aug 29, 2025 am 08:01 AM

How to install Oracle Database

Ensure that the system meets prerequisites such as hardware, operating system and swap space; 2. Install the required software packages, create oracle users and groups, configure kernel parameters and shell restrictions; 3. Download and decompress the Oracle database software to the specified directory; 4. Run runInstaller as oracle user to start graphical or silent installation, select the installation type and execute the root script; 5. Use DBCA to create the database silently and set the instance parameters; 6. Configure ORACLE_BASE, ORACLE_HOME, ORACLE_SID and PATH environment variables; 7. Start the instance through sqlplus/assysdba and verify the database status, confirm that the installation is successful,

Aug 29, 2025 am 07:51 AM