Let's look at an example of how to disable a unique constraint in Oracle. ALTER TABLE supplier DISABLE CONSTRAINT supplier_unique; In this example, we're disabling a unique constraint on the supplier table calle
Syntax -> set Unique KEY constraint on CREATE TABLE : MySQL: CREATE TABLE table_name(column1 datatype,column2 datatype,...,UNIQUE(column1)); SQL Server / Oracle / MS Access: CREATE TABLE table_name (column1 datatype UNIQUE, column...
1、直接本地连接 # 连接已有表空间 sqlplus wateruser/itcast@orcl 1. 2. 2、IP连接oracle 在sqlplus.exe所在目录下,执行如下命令: sqlplus 表空间/用户名@//地址:1521/orcl(实例名/全局数据库名,每个oracle数据库可以创建多个实例) sqlplus wateruser/itcast@//192.168.80.10:1521/orcl 1. ORACLE中的索引 什...
后台服务测试过程中,发现往Oracle数据库表中插数据出现一个错误 unique constraint,如下: ### Error updating database. Cause:Java.sql.SQLIntegrityConstraintViolationException:ORA-00001: unique constraint (TEST53.SYS_C0032604) violated ### The error may exist in class path resource [sqlmapper/ACMClaimMa...
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production 4.测试过程 表test2及其索引idx_test2_id对应的object_id。 SQL> select object_id,object_name from dba_objects where object_name in ('TEST2','IDX_TEST2_ID'); OBJECT_ID OBJECT_NAME ...
来源https://blog.csdn.net/u013736803/article/details/104631299/ 1.禁用该约束 select*fromuser_constraints cwherec.table_name='TABLE_NAME'; alter table TABLE_NAME disable constraint CONSTRAINT_NAME CASCADE; 2.删除表的时候,级联删除约束 drop table TABLE_NAME cascade constraints;...
问违反外键ORA-00001 unique约束的SQL约束EN外键约束 foreign key 外键约束的要求： 父表和字表必须...
To drop aUNIQUEconstraint, use the following SQL: MySQL: ALTERTABLEPersons DROPINDEXUC_Person; SQL Server / Oracle / MS Access: ALTERTABLEPersons DROPCONSTRAINTUC_Person; ❮ PreviousNext ❯ Track your progress - it's free! Log inSign Up...
1.13快速全局扫描从Oracle7.3后就可以使用快速全局扫描(Fast Full Scan)这个选项。这个选项允许Oracle执行一个全局索引扫描操作。快速全局扫描读取B-树索引上所有树叶块。初始化文件中的DB_FILE_MULTIBLOCK_READ_COUNT参数可以控制同时被读取的块的数目。 1.14跳跃式扫描从Oracle9i开始,索引跳跃式扫描特性可以允许优化器使用...
IN ORACLE / SQL Server / MS Access: Syntax: ALTER TABLEDROP CONSTRAINT<constraint_name>; Example: ALTER TABLE STUDENTS DROP CONSTRAINT stu_Info; NOT NULL Constraint in SQL Introduction to SQL SQL – Combining AND, OR and NOT together in where clause SQL SELECT Data...