在数据库里面使用TRUNCATE命令截断一个表的数据时,遇到如下错误 SQL >TRUNCATE TABLE ESCMOWNER.SUBX_ITEM ORA-02266: unique/primary keys in table referenced by enabled foreign keys 有时候对应的中文错误提示为:ORA-02266: 表中的唯一/主键被启用的外部关键字引用,一般出现这个错误,是因为表中的主键被其它表的外键所引用,导致删除数据时出错. 此时,你可以通过下面脚本查看一下…

关于ORA-02273错误,以前还真没有仔细留意过.昨天遇到了这个问题,遂顺便总结一番,以后遇到这类问题就可以直接用下面方案解决.如下所示,我们首先准备一下测试环境. CREATE TABLE TEST.TEST (  OWNER            VARCHAR2(30),    OBJECT_ID        NUMBER,    OBJECT_NAME      VARCHAR2(30) );   CREATE INDEX TEST.IX_TEST_N1 ON TEST.TEST(O…

1.SET FOREIGN_KEY_CHECKS=0; 2.DELETE FROM ACT_RE_DEPLOYMENT where 1=1; 或者 truncate table ACT_RE_DEPLOYMENT ; 3.SET FOREIGN_KEY_CHECKS=1:…

Each record in table should have a unique `key` prop,or set `rowKey` to an unique primary key. 1.react 报错 Each record in table should have a unique `key` prop,or set `rowKey` to an unique primary key. 表中的每个记录应该有唯一的“key”支持,或者将“rowKey”设置为唯一的主键. 2.解决方案…

相信不少人遇到过ORA-02429: cannot drop index used for enforcement of unique /primary key 这个错误,对应的中文提示"ORA-02429: 无法删除用于强制唯一/主键的索引",其实从错误提示信息已经很明显了.下面还是用一个简单的例子述说一下该错误的来龙去脉. ORA-02429错误的原因是因为用户试图删除一个用于强制唯一/主键的索引,解决方法也很简单,删除对应的约束就会自动删除该索引. [oracle@DB-Serv…

约束(constraint):对创建的表的列属性.字段进行的限制. 诸如:not null/unique/primary key/foreign key/check 作用范围:         ①列级约束仅仅能作用在一个列上         ②表级约束能够作用在多个列上(当然表级约束也能够作用在一个列上) 定义方式:列约束必须跟在列的定义后面,表约束不与列一起,而是单独定义. - -NOT NULL:不为空约束,仅仅能定义在列级 CREATE TABLE employees( employee_…

How can I list all foreign keys referencing a given table in SQL Server?  how to check if columns in table was used as foreign key in other tables   Not sure why no one suggested but I use sp_fkeys to query foreign keys for a given table: EXEC sp_fke…

Every movie needs a director and every rented movie needs to exist in the store. How do we make sure something in another table exists before inserting new data? This lesson will teach us about foreign keys and references. CREATE TABLE directors ( id…

1. Find foreign keys SELECT * FROM sys.foreign_keys WHERE referenced_object_id = object_id('Student') 2. Delete foreign keys SELECT     'ALTER TABLE ' +  OBJECT_SCHEMA_NAME(parent_object_id) +    '.[' + OBJECT_NAME(parent_object_id) +     '] DROP CON…

https://docs.microsoft.com/en-us/sql/relational-databases/tables/create-foreign-key-relationships?view=sql-server-2017 Create a foreign key relationship in Table Designer Create a foreign key relationship in Table Designer Using SQL Server Management…