create temporary table 表名 mysql自增长 auto_increment 添加外键约束 alter table 表名 add constraint fk_引用id foreign key(引用id) references 被引用表名 (被引用id) 添加主键约束 alter table 表名 add constraint pk_id primary key (id); 删除约束 alter table 表名 drop forign key fk_引用id 添...
INOUT: 表示输入输出参数,既可以输入功能,也可以输出功能 5.3-- ***mysql的变量*** -- 全局变量(内置变量):mysql数据库内置的变量 (所有连接都起作用) -- 查看所有全局变量: show variables -- 查看某个全局变量: select @@变量名 -- 修改全局变量: set 变量名=新值 -- character_set_client: mysql服务...
CREATE UNIQUE INDEX `ClaimedCoupon_envelopeId_unique` ON `ClaimedCoupon`(`envelopeId`); DROP INDEX `ClaimedCoupon.envelopeId_unique` ON `ClaimedCoupon`; A unique index is dropped but another one is created, so as you are reporting there is still an unexpected uniqueness constraint after the mi...
In MySQL, the syntax for ALTER TABLE Drop Column is, ALTER TABLE "table_name" DROP "column_name"; In Oracle, SQL Server, and Google BigQuery, the syntax for ALTER TABLE Drop Column is, ALTER TABLE "table_name" DROP COLUMN "column_name"; Let...
Error 'Cannot add or update a child row: a foreign key constraint fails故障解决 2016-06-12 16:46 −一大早的,某从库突然报出故障:SQL线程中断! 查看从库状态: mysql> show slave status\G Slave_IO_State: Waiting for master to send event Master_Log_File: mysql-bin.026023 R... ...
#Add Unique Constraint and Copy Unique Rows to Original Table To make sure there are no duplicates added in future, we can extend the previous set of queries to add aUNIQUEconstraint to the column. # Step1:CopydistinctvaluestotemporarytableCREATETEMPORARYTABLEtmp_user (SELECTid, nameFROMuserGROU...
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mysql> show create table t\G [...] KEYname(name), KEYname_2(name), KEYname_3(name) [...] MySQL detects that the ‘name’ index already exists so it creates the new one appending a number at the end of the name. This type of indexes are easy to find out and to avoid them....
Expand Down Expand Up @@ -723,9 +716,6 @@ CREATE UNIQUE INDEX UNIQUE_CTLG ON CTLGS ("NAME"); -- Constraints for table PART_COL_STATS for class(es) [org.apache.hadoop.hive.metastore.model.MPartitionColumnStatistics] ALTER TABLE PART_COL_STATS ADD CONSTRAINT PART_COL_STATS_FK1 FOREIGN ...