DataCareers Job location Eastern England, UK Salary Undisclosed Posted 1d ago Hosted by Adzuna Job details Role: DBA - Azure SQL Location: Hybrid - mainly home based with very occasional travel to HQ in the South of the UK. Salary: £38,000 a comprehensive range of Employee Benefits. Key...
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ALTER TABLE dbo.cnst_example NOCHECK CONSTRAINT salary_cap; INSERT INTO dbo.cnst_example VALUES (3,'Pat Jones',105000) ; -- Re-enable the constraint and try another insert; this will fail. ALTER TABLE dbo.cnst_example CHECK CONSTRAINT salary_cap; INSERT INTO dbo.cnst_example VALUES (4,'...
Income Estimation: $406,450 - $631,362 Auditing Skill Proof Department Manager Income Estimation: $58,066 - $96,947 Field Auditor Income Estimation: $63,223 - $88,032 This job has expired. Apply for this job and sign up for alerts Employees:Get a Salary Increase...
ALTER TABLE dbo.cnst_example CHECK CONSTRAINT salary_cap; INSERT INTO dbo.cnst_example VALUES (4,'Eric James',110000) ; B. トリガーを無効にして再度有効にする 次の例では、DISABLE TRIGGER のALTER TABLE オプションを使用してトリガーを無効にし、通常はトリガー違反となるような挿入を許...
Update employee100 set salary = 60000 where e_id=1; Delete a record Delete from employee100 where e_id=1; Data Integrity SQL enforces the data integrity constraints to manage the accuracy and Purpose: Prevents from adding up invalid and duplicate data Integrity rules include: PRIMARY KEY...
一般程序员可以完成前3个任务,后两个任务由DBA来完成。 标准的SQL语句分为几种类型: 1、查询语句:主要由select关键字完成,查询语句是SQL语句中最复杂、功能最丰富的语句。 2、DML(Data Manipulation Language,数据操作语言)语句:主要由insert、updata和delect三个关键字组成。
UPDATE employees SET salary = salary + TO_NUMBER('100.00', '9G999D99') WHERE last_name = 'Perkins'; The nlsparam string in this function has the same purpose as it does in the TO_CHAR function for number conversions. SELECT TO_NUMBER('-AusDollars100','L9G999D99', ' NLS_NUMERIC_...
1、唯一约束:uk_表名称_字段名。uk是UNIQUE KEY的缩写。比如给一个部门的部门名称加上唯一约束,来保证不重名,如下:ALTER TABLE t_dept ADD CONSTRAINT un_name UNIQUE(name); 2、外键约束:fk_表名,后面紧跟该外键所在的表名和对应的主表名(不含t_)。子表名和父表名用下划线(_)分隔。如下:ALTER TABLE t...
salary number(10,2) ) • UNIQUE(唯一)UNIQUE约束可以插入NULL值 create tableemp3( --列级约束 id number(10) constraint emp3_id_ukunique, name varchar2(20) constraint emp3_name_nn not null, email varchar2(30), salary number(10,2), ...