Oracle Constraint Types Constraint Name Describle PRIMARY KEY 主键约束,一张表中即可以有主键也可以没有;如果有,有且只能有一个PRIMARY KEY. FOREIGN KEY 外键约束 NOT NULL 非空约束 UNIQUE 唯一约束.主键约束,从约束本身来讲就相当于(NOT NULL) + (UNIQUE) CHECK 检查约束 分类: Oracle DBA 标签: ORACLE...
1 主键约束主键约束列级：create table types(t_id number primary key,t_name varchar2(30) unique,t_description varchar2(100),constraint types_unique_name unique(t_name));主键约束表级：create table types(t_id number(4),t_name varchar2(30),t_description varchar2(100),constraint types_pk_id...
The constraint types supported by the Oracle database are as follows: UNIQUE NOT NULL PRIMARY KEY FOREIGN KEY CHECK Constraints have names. It is good practice to specify the names with a standard naming convention, but if they are not explicitly named, Oracle will generate names. 由上可知,每...
EXCLUDE Exclude specific objecttypes, e.g. EXCLUDE=TABLE:EMP. IMPDP导入时忽略索引可以使用类似如下参数: EXCLUDE=CONSTRAINTEXCLUDE=INDEX 如果导入时遇到如下错误,就需要调整REMAP_SCHEMA参数: ORA-39146: schema "SMS_MT" does not exist 遇到如下错误,那就需要制定REMAP_TABLESPACE参数: ORA-00959: tablespace '...
constraint person_name_uk unique(name) ); 4.检查约束 使用检查约束可以来约束字段值的合法范围。 范例:创建一张表性别只能是1或2 create table person( pid number(10) , name varchar2(10), gender number(1) check(gender in (1, 2)),
In most places in the Oracle documentation, the two terms are used interchangeably, with the notable exception of the foreign key constraint, which is discussed later in this chapter. Four different types of index structures, which are described in the following sections, are used in Oracle: ...
CONSTRAINT_TYPE : U --- PL/SQL procedure successfully completed. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. CTAS创建表, AI检测代码解析 CREATE TABLE t1_1 AS SELECT * FROM t1; 1. 可以看到,新的表只存在...
r_constraint_schema name r_constraint_name name 被引用约束的名字 delete_rule text 外键约束的级联删除规则 is_deferrable boolean 表示约束是 DEFERRABLE 还是 NOT DEFERRABLE deferred boolean 表示约束是 DEFERRED 还是 IMMEDIATE 3.8.3.12 dba_indexes DBA_INDEXES描述了数据库中的所有索引。要收集此视图的统计信...
Examples of constraint types include primary key constraints, foreign key constraints, and check constraints. Specified by: getConstraintType in class Constraint Returns: a string value indicating the type of constraint. getIndexID public DBObjectID getIndexID() Get the Index that implements this ...
Creating Constraint: PK_TBUSEROPERATEINFO Creating Constraint: PK_TBUSER Creating Constraint: PK_DTV Creating Constraint: PK_TBTAG Creating Constraint: PK_TBROLES Creating Constraint: PK_TBPROJECT Creating Constraint: PK_TBMENU Creating Constraint: PK_TBLOGININFO ...