使用*_indexes视图的constraint_index列。使用上面的DDL：
1 row created. INSERT INTO orders (order_id, order_date, customer_id, order_total, promotion_id) VALUES (2460, systimestamp+1, 106, 110, 2); insert into orders (order_id, order_date, customer_id, order_total, promotion_id) * ERROR at line 1: ORA-00001: unique constraint (OE....
CONSTRAINT s_dept_name_region_id_uk UNIQUE(name, region_id)); 8. 较复杂的创建表例子 SQL> CREATE TABLE s_emp (id NUMBER(7) CONSTRAINT s_emp_id_pk PRIMARY KEY, last_name VARCHAR2(25) CONSTRAINT s_emp_last_name_nn NOT NULL, first_name VARCHAR2(25), userid VARCHAR2(8) CONSTRAINT ...
Function-based unique indexes can be useful in defining a conditional unique constraint on a column or combination of columns. Refer to "Using a Function-based Index to Define Conditional Uniqueness: Example" for an example. See Also: Oracle Database PL/SQL Packages and Types Reference for mor...
When you create a primary key or unique constraint, Oracle Database will automatically create a unique index for you (assuming there isn't an index already available). In most cases you'll add the constraint to the table and let the database build the index for you....
The ALTER TABLE statement is used in Oracle to add columns to an existing table. Syntax: ALTERTABLEtable_nameADDcolumn_name data_typeconstraint Parameters: table_name:The existing table’s name. column_name:The new column’s name. data_type:The new column’s data type. ...
例如: 非空NOTNULL不允许重复UNIQUE关键字PRIMARYKEY按条件检查CHECK(条件) 外键REFERENCES表名(字段名)3. 创建表的例子CREATETABLEDEPT( EPTNONUMBER(2)CONSTRAINTPK_DEPTPRIMARYKEY, DNAMEVARCHAR2(14), LOCVARCHAR2(13)) ;CREATETABLEregion( IDnumber(2)NOTNULLPRIMARYKEY, ...
constraintsoracle删除delete约束constraint oracle创建和删除约束(Oraclecreateanddeleteconstraints) Dataintegrityconstraints:creation,deletion,statementsof primarykeys,foreignkeys,andvariousconstraints ORACLEconstraintsondatabaseintegrity: Threewaystomaintaindataintegrity:ORACLEintegrity constraints,databasetriggers,applicationcod...
Create an Oracle Table with a Unique PRIMARY KEY Constraint Name Create an Oracle Table with Composite PRIMARY KEY What is the PRIMARY KEY in the Oracle Table? In Oracle, a PRIMARY KEY is a column or columns that uniquely identify every row of a table. It guarantees that every row in...
[CONSTRAINT[constraint_name]]{PRIMARYKEY|UNIQUE}(column_name)//在创建所有列后添加约束|[CONSTRAINT[constraint_name]]FOREIGNKEY(column_name,column_name...)references_clause constraint_state|[CONSTRAINT[constraint_name]]CHECK(expression)constraint_state]column_definition_list: column_definition[,column_...