MySQL? ???? ?? ???? ???? ? ???? ??
??? ??????? ??? ? ?? ???? ???? ???? ?? ??? ????. ??? ????. ? ??? MySQL?? 3?? JOIN? ???? ?? ???? ??? ?????.
??: ? ?? ?? ???(??, ?? ? ???)? ?? ???? ?? ???? ? ???? ????. ????).
?? ???:
people id last_name first_name email 1 Smith Fred Fred@.. 2 Jones Tom Tom@.. 3 Doe Jane Jane@.. taxonomy id taxonomy 1 age 2 gender 3 height details id person_id detail_id content 1 1 1 36 2 1 2 M 3 1 3 5'10" 4 2 1 29 5 2 2 M 6 2 3 6'3" 7 3 1 27 8 3 2 F 9 3 3 5'8"
??? ??(? ???):
id last_name first_name email age 1 Smith Fred Fred@.. 36 2 Jones Tom Tom@.. 29 3 Doe Jane Jane@.. 27
3?? JOIN? ???? ???:
? ???? ???? ??? ???? ???. ?? ?? ???? ? ?? ?? ???? ???? 3?? JOIN:
CREATE TABLE new_table AS SELECT p.*, d.content AS age FROM people AS p JOIN details AS d ON d.person_id = p.id JOIN taxonomy AS t ON t.id = d.detail_id WHERE t.taxonomy = 'age';
? JOIN? people ???? ???? person_id ?? ???? ? ?? ?? ???? ??? ?? ?? ?? ???? ??? ?????. Detail_id ?? ???? ?? ?? ???? ???? ??? 'age'? ?? ??????.
?? ?? ??(?? ??? ??):
???? ????? ?? ??(??, ??, ? ?)? ????? ? ??? ?? ??? JOIN? ???? ???.
CREATE TABLE new_table AS SELECT p.*, d1.content AS age, d2.content AS gender, d3.content AS height FROM people AS p JOIN details AS d1 ON d1.person_id = p.id JOIN taxonomy AS t1 ON t1.id = d1.detail_id JOIN details AS d2 ON d2.person_id = p.id JOIN taxonomy AS t2 ON t2.id = d2.detail_id JOIN details AS d3 ON d3.person_id = p.id JOIN taxonomy AS t3 ON t3.id = d3.detail_id WHERE t1.taxonomy = 'age' AND t2.taxonomy = 'gender' AND t3.taxonomy = 'height';
? ?? ??? ???? ?? ?? ???? ?? ?? ?? ???? ? ???? ??? ? ????.
? ??? JOIN? ???? ? ?? MySQL ???? ???? ? ???? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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MySQL ? ? ???? NULL ?? ?????
Jul 05, 2025 am 02:46 AM
MySQL?? NULL ?? ?? ? ? 1. ???? ?? ? ? ? ??? NotNull? ???? ?? ??? NULL? ?????. 2. iSnull ?? ISNOTNULL = ??! =; 3. Ifnull ?? Coalesce ??? ????? ???? ???? ? ??? ? ????. 4. ?? ?? ????? NULL ?? ?? ??? ?? ???? ??? ?? ? ORM ??? ?? ?? ?????? ??????. NULL? ???? ?? ?? ???? ??? ???? ?? ?? ?? ????. ??? ???? ??, ?? ? ???? ?? ? ??? ?? ??? ??? ?? ???????. ??? ??? ???? ??? ?? ?? ??? ????? ?? ? ????.
MySQL?? mysqldump? ???? ?? ??? ?????
Jul 06, 2025 am 02:55 AM
MySQLDump? MySQL ??????? ??? ??? ???? ???? ?????. ??????? ???? ?? ?? ? ?? ?? ???? SQL ??? ?????. 1. ?? ??? ????? ??? ?????? ??? ???? ??? SQL ???? ?????. 2. ??? ?????? ?? ??? ??? ???? TB ?? ???? ?? ???? ???? ????. 3. ???? ???-single transaction,-databases,-all-databases,-routines ?; 4. MySQL ??? ???? ?? ?? ?? ?? ?? ? ??? ?? ??? ???? ? ????. 5. ??? ????? ????? ?? ? ?? ??? ???? ?? ????.
MySQL?? ?????? ? ??? ?? ??
Jul 06, 2025 am 02:41 AM
MySQL ?????? ? ???? ??? ??? information_schema? ?? ????? ?? ? ??? ??? ? ????. 1. ?? ?????? ?? ?? : SQL ?? ???? selecttable_schemaas'database ', sum (data_length index_length)/1024/1024as'size (mb) 'frominformation_schema.tablessgroupbytable_schema; ?? ??????? ? ??? ??? ?? ??????? ???? ??? ?? ? ? ????. 2. ?? ??? ??? ?????? : selectta? ??????
MySQL?? ??? ?? ? ???? ??? ?????
Jul 08, 2025 am 02:51 AM
?? ?? ? ?? ?? ??? ??? ??? ?????? ?? ??? ??? ?????? ??? ?????? ?????? ??? ?????. ? ?? ?? ???? ????. ??, ??????, ??? ? ??? ?? ??? UTF8MB4? ???? ???? ShowCreatedAtabase/Table? ???? ? Alter ??? ??????. ??, ?????? ??? ? UTF8MB4 ?? ??? ???? ?? ?? ??? ????? SetNames? ??????. ??, ?? ??? ????? ???? UTF8MB4_UNICODE_CI? ???? ?? ? ????? ???? ???? ?????? ???? ?? ? ? ?? ?? ??? ????? ??????.
MySQL?? ??? ?? ???? ???? ??? ????.
Jul 05, 2025 am 02:42 AM
GroupBy? ???? ???? ????? ?? ??? ???? ? ???? ??? ? ??? ????? ? ?????. ?? ??, GroupByCustomer_ID? ???? ? ??? ? ???? ??? ? ????. ???? ? 1,000 ? ??? ? ??? ??? ?? ? ? ????. ?? ? ? ?? ??? GroupBy? ??????, ?? ?? ?? ???? ???? ??? ??? ? ? ????. ???? ???? ? ??? ? ??, ?? ?? ??? ? ?? ???? ???? ?????.
MySQL?? ???? ?? ? ?? ?? ??
Jul 08, 2025 am 02:50 AM
MySQL? ???? ??? ???? InnoDB ?? ??? ???? ??? ???? ???? ?????. 1. ????? ??? SQL ?? ????, ?? ?? ?? ?? ??? ?????. 2. ? ???? ???, ???, ?? ? ???? ?????. 3. ????? ???? ????? ??? STARTTRANSACTION, CONMING ? ROLLBACK???. 4. 4 ?? ?? ???? ?? ??, ?? ? ??, ?? ??? ?? ? ???? ?????. 5. ????? ???? ???? ?? ??? ??? ?? ??? ?? ?? ? ??? ????? ??????. ??? ????? ?? MySQL? ?? ???? ?? ??? ?? ? ? ????.
?? ? ?????? ???? MySQL ??????? ?????
Jul 07, 2025 am 01:50 AM
MySQL ??????? ???? ?? ???? ??? ?? ? ?????? ???? ????. ?? MySQL -U ??? ?? -P? ???? ????? ???? ???? ??? ?????? ??????. ?? ??????? ???? ?? ??? ??? ????? -h ?? ??? ???????. ??, mysql-u username-p database name ?? mysql-u username-p database name? ?? ??? ? ? ?? ??????? ?? ????? ??? ? ? SQL ??? ??? ? ????.
MySQL?? ??? ?? ? ???? ??
Jul 07, 2025 am 01:41 AM
MySQL? ?? ?? ? ???? ?? ??? ??? ??, ?? ?? ? ???? ??? ??? ? ?????. ??, ??? ??? UTF8MB4? ?? ?? ??? ?? ??? ?????. ?? ??? UTF8MB4_UNICODE_CI? ?? ?? ?? ??? ???? UTF8MB4_BIN? ?? ?????. ??, ?? ??? ?? ??? ??, ??????, ??? ? ??? ??? ? ????. ??? ??? ?? UTF8MB4 ? UTF8MB4_UNICODE_CI? ?? ? ???? ???? ?? ????. ??, ?? ??? ?? ??? ?? ???? ?? ??, ?? ?? ???? ??? ??? ?? ???? ???? ??? ???? ???? ???????. ?? ?? ??? ???? ?? ???? ? ??? ? ?? ??? ???????.
