using index可以让你在创建主键、唯一性约束的时候使用指定的索引或创建索引、或修改索引的存储结构。 不用using index创建主键的情况 先不用using index,创建主键时oracle自动创建唯一索引。主键名和索引名一致,主键列和索引列一致。 alter table emp add constraint pk_emp_id primary key(emp_id); 执行上面语句的...
createuniqueindexuid_test_uidontest_uid(name) tablespace tablespace2); 当然也可以部分处理。 1 2 3 Createtabletestone (namevarchar(10char)) tablespace1; Altertabletestoneaddconstraintpk_testine1primarykey(name) usingindextablespace tablespace2; 作为一个好习惯,不要把索引和表格的数据放在同一个表空间。
create table employees (empno number(5) constraint emp_pk primary key,...) 定义primary key约束(多个字段,在表级定义约束) create table employees (empno number(5), deptno number(3) not null, constraint emp_pk primary key(empno,deptno) using index tablespace indx storage (initial 64K next 64K...
set CONSTRAINTS PK_TEST immediate ORA-02447: cannot defer a constraint that is not deferrable --索引不能延迟验证 SQL> alter table test drop constraints pk_test 2 / Table altered SQL> alter table TEST 2 add constraint PK_TEST primary key (ID) 3 deferrable 4 using index 5 tablespace users ...
constraint emp_pk primary key(empno,deptno) using index tablespace indx storage (initial 64K next 64K ) ) ORACLE自动会为具有PRIMARY KEY约束的字段(主码字段)建立一个唯一索引和一个NOT NULL约束,定义PRIMARY KEY约束时可以为它的索引 指定存储位置和存储参数 ...
add constraint uni_ename unique(ename) * ERROR at line 2: ORA-02261: such unique or primary key already exists in the table 04:39:10 SQL> alter table t1 04:39:17 2 add constraint u_name unique(name) 04:39:20 3 using index (create index ind_name on t1(name)); ...
USING INDEX TABLESPACE student_index; 4、创建Check约束 ALTER TABLE students ADD CONSTRAINT ck_students_st_lic CHECK ((state IS NULL AND license_no IS NULL) OR (state IS NOT NULL AND license_no is NOT NULL)); 5、创建外键约束 ALTER TABLE students ...
alter table userlevelbytel_bak drop constraint pk_primary; CREATETABLE"NEWCCS"."USERLEVELBYTEL_BAK"("CUSTTEL"VARCHAR2(20),"USERLEVEL"NUMBER(*,0)NOTNULLENABLE,"CUSTID"VARCHAR2(20),CONSTRAINT"UNIQUE_CUSTTEL"UNIQUE("CUSTTEL")USINGINDEXPCTFREE10INITRANS2MAXTRANS255COMPUTESTATISTICSSTORAGE(INITIAL65536...
在创建表时，只能指定主键与唯一键的索引表空间，其它类型的索引，只能通过CREATE INDEX/ALTER INDEX来指定。参考如下：create table test1 (id number(10),name varchar2(20),age number(3),constraint pk_test1 primary key(id) using index tablespace tbs_ind )tablespace tbs_cur;...
USING INDEX TABLESPACE student_index; 3、创建Unique约束 ALTER TABLE students ADD CONSTRAINT uk_students_license UNIQUE (state, license_no) USING INDEX TABLESPACE student_index; 4、创建Check约束 ALTER TABLE students ADD CONSTRAINT ck_students_st_lic ...