1

mysqlops MySQL DBA

MySQL MySQL DBADBA DBA MySQL

MySQL MySQL

SQL ServerOracleDB2 WindowsSQL Server PostgreSQL NoSQLLicense

MySQL MySQL

MySQL MySQL MySQLGPL MySQL MySQL MySQL MySQL DBA

MySQL MySQL MySQL MySQL MySQLMySQL AB MySQL MySQL AB MySQL AB MySQLJOINGlobal IndexMyISAM

MySQL

DBA DBA--DBADBAMySQL DBA -- DBA DBA SQLMySQL DBA SQL DBA -- MySQL DBA +

DBA DBA

DBA

DBA SQL SQL

MySQL MySQLDDLDMLSQLJOIN()I/OJOINI/OJOIN ()(continue)

MySQL MyISAMInnoDBMEMORY DDL DML SELECT MySQLInnoDBREAD UNCOMMITEDREAD COMMITEDREPEATABLE READSERIALIZABLE MySQLBUG List->->->->->->

MySQLSTATEMENTROWMIXEDREAD UNCOMMITEDREAD COMMITEDREPEATABLE READSERIALIZABLE transaction-isolation = read-committedbinlog-format = mixedtransaction-isolation = repeatabled-readbinlog-format = mixed

MySQL InnoDB

MySQL SELECT M.columnname,N.* columnname..FROM left_table M LEFT JOIN right_table N ON M. columnname_join=N. columnname_join AND N. columnname=XXXWHERE M.columnname=XXX AND M...

ONM. columnname_join=N. columnname_join left_tableright_table right_tableNULLONright_table. columnname=XXXright_tableNULLWHERE

SELECT M.columnname,N.* columnname..FROM left_table M LEFT JOIN right_table N ON M. columnname_join=N. columnname_join AND N. columnname=XXX AND M.columnname=XXX ;

MySQL

MySQL

SQL

DBA

DBA20%

DBA

&