-- 建表时创建外键 constraint 外键名 foreign key (子表字段) references 父表名(父表字段); -- 建表是创建多个外键约束 foreign key (子表字段) references 父表名(父表字段), foreign key (子表字段) references 父表名(父表字段), ...; -- 建表后创建外键 alter table 子表名 add constraint 外...
AI代码解释 INSERTINTOT1VALUES (1,2,'a'), (2,3,'b'), (3,2,'c'), (4,3,'d'), (5,2,'e');COMMIT;ALTERTABLET1ADDINDEX(B),ADDUNIQUEINDEX(C); 注意使用下面的方法效率比上面低,因为聚集索引要被扫描2次。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 CREATEINDEXBONT1(B);CREATE...
I have a table with a check constraint to check year values. The first digit can be 1 or 2 and the other 3 digits can be any number from 0-9. This is the DDL for it: CONSTRAINT `ValidBirthYear` CHECK ((`DateOfBirth` like _utf8mb4'[1-2][0-9][0-9][0-9]')), ...
[VISIBLE | INVISIBLE][AUTO_INCREMENT] [UNIQUE [KEY]] [[PRIMARY] KEY][COMMENT ‘string’][COLLATE collation_name][COLUMN_FORMAT {FIXED | DYNAMIC | DEFAULT}][ENGINE_ATTRIBUTE [=] ‘string’][SECONDARY_ENGINE_ATTRIBUTE [=] ‘string’][STORAGE {DISK | MEMORY}][reference_definition][check_con...
CHECK ® CHECKSUM CIPHER CLASS_ORIGIN CLIENT CLONE; added in 8.0.3 (nonreserved) CLOSE COALESCE CODE COLLATE ® COLLATION COLUMN ® COLUMNS COLUMN_FORMAT COLUMN_NAME COMMENT COMMIT COMMITTED COMPACT COMPLETION COMPONENT COMPRESSED COMPRESSION CONCURRENT CONDITION ® CONNECTION CONSISTENT CONSTRAINT ...
constraint /kənˈstreɪnt/ n. 限定;约束 5.1.1完整性约束条件 5.1.2 数据表的复合主键 所谓的复合主键 就是指表的主键含有一个以上的字段组成 比如 createtabletest ( namevarchar(19), id number,valuevarchar(10),primarykey(name,id)
set_allowlist_errors() : dd::upgrade::Bootstrap_error_handler set_alter_mode() : dd::Check_constraint, dd::Check_constraint_impl set_altered_partitions() : Partition_helper set_ancestor() : Window set_and_truncate() : sys_var set_anonymous() : Gtid_specification set_applier_metric_collec...
Backup failed to insert file header (check configuration) 1346 MySQL error. DMEC NDB error type. Application error Error message. Backup failed to insert table list (check configuration) 1347 MySQL error. DMEC NDB error type. Application error Error message. Backup failed to...
5、 原表属性 1nu mber, name, age, major FROM collegeWITH LOCAL CHECK OPTION;# 查看视图的详细结构 SHOW CREATE VIEW college_view 。#向视图中插入记录 INSERT INTO college_view VALUES( 0901,张三,20,外语);# 修改视图也可以用 CREATE OR REPLACE ALGORITHM=UNDEFINED VIEWcollege_view (stude nt_num,...
CONSTRAINT `QRTZ_TRIGGERS_ibfk_1` FOREIGN KEY (`SCHED_NAME`, `JOB_NAME`, `JOB_GROUP`) REFERENCES `QRTZ_JOB_DETAILS` (`SCHED_NAME`, `JOB_NAME`, `JOB_GROUP`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- --- -- Records of QRTZ_TRIGGERS -- --- -- --- -- Table structure for t...