You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent house...
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其他好文 时间：
2015-07-06 18:11:40
阅读次数：
171
使用主外键约束使得数据具有完整性。
1、查询表上所有的约束
select * from user_constraints t
where t.table_name='FATHER';
2、查询具有主外键关系的表
select c.owner,c.constraint_name,c.constraint_type,c.table_name,f.owner,f.constraint_name...
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数据库 时间：
2015-07-03 17:34:57
阅读次数：
157
ALTER TABLE Student --主键约束ADD CONSTRAINT PK_StuNo PRIMARY KEY (StudentNo)ALTER TABLE Student --唯一约束（身份证号唯一）ADD CONSTRAINT UQ_stuID UNIQUE (IdentityCar...
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数据库 时间：
2015-07-03 12:16:23
阅读次数：
297
题目：You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping...
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其他好文 时间：
2015-07-01 13:52:20
阅读次数：
107
CREATE TABLE employees_demo( employee_id NUMBER(6), first_name VARCHAR2(20), last_name VARCHAR2(25)CONSTRAINT emp_last_name_nn_demo NOT NULL, email VA...
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数据库 时间：
2015-06-27 06:22:16
阅读次数：
135
#198 House Robber
You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them...
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其他好文 时间：
2015-06-25 21:16:15
阅读次数：
110
在MySQL中，InnoDB引擎类型的表支持了外键约束。? [CONSTRAINT?symbol]?FOREIGN?KEY?[id]?(index_col_name,?…)
REFERENCES?tbl_name?(index_col_name,?…)
[ON?DELETE?{RESTRICT?|?CASCADE?|?S...
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数据库 时间：
2015-06-25 17:51:10
阅读次数：
194
Description:You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint...
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其他好文 时间：
2015-06-25 12:19:18
阅读次数：
100
SQL> create table cust(id number,name varchar2(10));Table createdSQL> alter table cust add constraint cust_id_pk primary key(id) deferrable initially ...
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数据库 时间：
2015-06-25 12:07:01
阅读次数：
199
Description：You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint...
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其他好文 时间：
2015-06-24 01:56:47
阅读次数：
117
