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Technical Articles

Database

An Introduction to MongoDB Atlas

MongoDBAtlasistheofficialfullymanagedclouddatabaseserviceforMongoDBthatsimplifiesdeployment,management,andscalingofdatabases.1.Itenablesone-clickdeploymentacrossAWS,GoogleCloud,orAzurewithafreetieravailableforlearningandsmallprojects.2.Securityfeatur

Aug 11, 2025 am 11:10 AM

nosql database

How to use ROW_NUMBER() in SQL?

ROW_NUMBER() is a window function in SQL for assigning unique serial numbers, suitable for ranking, paging, and deduplication. 1. The basic usage is ROW_NUMBER()OVER(ORDERBYcolumn_name), which can be sorted and numbered in the specified column; 2. Support grouping numbering, and the syntax is ROW_NUMBER()OVER(PARTITIONBYgroup_columnORDERBYorder_column), such as order amounts sorted and numbered after grouping by sales personnel; 3. It is often used to deduplicate, keep the first record in each group, such as grouping through mailbox and keeping the earliest registration record; 4. Paging query can be implemented to obtain specific page data through the number range; 5

Aug 11, 2025 am 11:07 AM

How to use variables in phpMyAdmin query

UseMySQLuser-definedvariables(e.g.,@variable)tostoreandreusevaluesinphpMyAdmin;2.RunmultiplestatementstogetherinoneSQLwindowwithsemicolons,ensuring"Allowmultiplequeries"isenabled;3.Optionallyusevariablesinpreparedstatementsfordynamicqueries

Aug 11, 2025 am 10:43 AM

variable

How to back up a database in MySQL

Using mysqldump is the most common and effective way to back up MySQL databases. It can generate SQL scripts containing table structure and data. 1. The basic syntax is: mysqldump-u[user name]-p[database name]>backup_file.sql. After execution, enter the password to generate a backup file. 2. Back up multiple databases with --databases option: mysqldump-uroot-p--databasesdb1db2>multiple_dbs_backup.sql. 3. Back up all databases with --all-databases: mysqldump-uroot-p

Aug 11, 2025 am 10:40 AM

mysql database backup

Navicat alternatives: security options

Navicatalternativesofferrobustsecurityoptions:1)DBeaverprovidesSSL/TLSencryption,RBAC,andauditlogging;2)HeidiSQLsupportsSSL/TLSwithbasicaccesscontrol;3)pgAdminoffersSSL/TLS,RBAC,detailedauditlogging,androw-levelsecurity.

Aug 11, 2025 am 10:34 AM

Security Options Database Tools

phpMyAdmin set a primary key

TosetaprimarykeyinphpMyAdmin,firstdetermineifyou'recreatinganewtableormodifyinganexistingone.1.Whencreatingatable,entercolumndetailsandcheckthe"Primary"checkboxforthedesiredcolumn,optionallyenabling"A_I"forauto-increment.2.Foranex

Aug 11, 2025 am 10:33 AM

How to use CASE statements in MySQL

SearchedCASEisusedforcomplexconditionswithexplicitcomparisonslike>,

Aug 11, 2025 am 10:29 AM

Why are my query results not showing?

If your query does not display results, it is usually due to a combination of technical or content-related issues. 1. Query syntax or format errors may cause the system to fail to parse the request correctly, such as spelling errors, missing operators or case mismatch; 2. The data does not meet the search criteria, such as strict filtering, lack of wildcards or insufficient data volume; 3. Indexing or caching issues may make the system unable to retrieve the latest data; 4. Permission restrictions may cause some users to be unable to access specific information. Checking these problems one by one can help you find the cause and solve the problem.

Aug 11, 2025 am 10:25 AM

How to implement slowly changing dimensions (SCD) in SQL?

Type1 update does not retain history, but directly modify the original record; Type2 retains the complete history by adding new lines, using the start date, end date and current flag to manage the version; Type3 adds old value fields to the original record, and only retains the previous version information; the selection is based on historical requirements, storage and complexity, among which Type2 is often used in data warehouses.

Aug 11, 2025 am 10:18 AM

How to use the MERGE statement for UPSERT operations in SQL?

TheMERGEstatementenablesUPSERToperationsbyupdatingexistingrowsorinsertingnewonesbasedonamatchcondition,withsyntaxvaryingslightlyacrossSQLServer,Oracle,andSnowflake.1)ItusesMERGEINTOtarget_table,specifiesasourcewithUSING,anddefinesamatchviaON(target.k

Aug 11, 2025 am 10:17 AM

sql MERGE語句

How to create a stored procedure in Navicat?

The key to creating stored procedures in Navicat is to understand the database type and its syntax differences. The following are the specific steps: 1. Preparation: Confirm the connected database type (such as MySQL, PostgreSQL or SQLServer) because the stored procedures of different databases are different syntax; 2. Open the "Store Procedure" panel and create a new one: Enter the stored procedure management interface through the Navicat interface, right-click to select "New stored procedure", enter the name and use the template structure; 3. Write SQL logic: Define parameters and statements, such as adding IN parameters to MySQL and writing query logic in the BEGIN...END block, pay attention to using DELIMITER to set the ending character; 4. Test and call

Aug 11, 2025 am 09:52 AM

How to perform a case-insensitive search in MySQL?

MySQL is case-insensitive by default. Usually, _ci collation is used to achieve case-insensitive search; 1. Use the default case-insensitive collation (such as utf8mb4_general_ci) to make equal value comparisons and LIKE automatically ignore case; 2. Use LOWER() or UPPER() functions to convert the comparison to the same case to the same case, but be careful to affect the index usage; 3. Use COLLATE to specify temporary case-insensitive collation to overwrite the original settings of the column; 4. MySQL does not support the ILIKE operator, and LIKE combined with LOWER() or COLLATE to achieve similar functions; the best practice is to ensure that the column uses _ci collation

Aug 11, 2025 am 09:47 AM

mysql 大小寫不敏感搜索

How to export query results to CSV in phpMyAdmin

RunyourSQLqueryinphpMyAdminbyselectingthedatabase,enteringthequeryintheSQLtab,andclicking"Go".2.Aftertheresultsappear,scrolltothebottomandclickthe"Export"linkbelowtheresultset.3.Ontheexportpage,choose"Quick"or"Custo

Aug 11, 2025 am 09:46 AM

How to handle errors during data import?

Data import errors are common and can be solved, the key is to troubleshoot according to the steps. 1. Check whether the file format is consistent with the system requirements, such as the line breaks or date formats in CSV do not match. 2. Ensure that the field types match. If the number field does not contain strings, pay attention to the identification differences between different time formats. 3. Verify data integrity, check the uniqueness of primary keys and missing key fields in advance, and use tools to count empty values. 4. Handle encoding and special character issues, clearly specify the encoding format, and check invisible characters and illegal escape characters. 5. Use logs and error information to locate problems, enable detailed log mode and correct the original data details errors according to the prompts.

Aug 11, 2025 am 09:26 AM