USER is "SCOTT" SQL>Select * from emp 1. 2. 3. 4. 把查询结果写入表中 create table emp1 as select * from emp where 1=2; insert into emp1(empno) values((select empno from emp where ename = 'SMITH' )); 1. 2. 说明:当where条件不成立,仅复制表结构不复制数据。 统计 select count ...
ALTERTABLE person ADD CONSTRAINT person_pid_PK PRIMARY KEY(pid); ALTERTABLE person ADD CONSTRAINT person_name_UK UNIQUE(name); ALTERTABLE person ADD CONSTRAINT person_age_CK CHECK(age BETWEEN 0 AND 150); ALTERTABLE book ADD CONSTRAINT person_book_pid_fk FOREIGN KEY(pid) REFERENCESperson(pid) ...
SQLQuery2.sql_emp --创建新的数据库 createdatabasesqdb1 --创建delp表 createtabledept ( deptnointprimarykey, danamenvarchar(30), locnvarchar(30) ) --创建emp表 createtableemp ( empnointprimarykey, enamenvarchar(30), jobnvarchar(30), mgrint, hiredatedatetime, salnumeric(10,2), commnumeric(...
百度试题 结果1 题目SQL语言中,删除EMP表中全部数据的命令是() A. delete * from empB) drop table emp B. truncate table emp C. 没有正确答案 相关知识点: 试题来源: 解析 C) truncate table emp 反馈 收藏
CREATEDATABASE`emp`; USEemp; CREATETABLE`dept`( `deptno`INT(2)NOTNULL, `dname`VARCHAR(14), `loc`VARCHAR(13), CONSTRAINTpk_deptPRIMARYKEY(deptno) )ENGINE=INNODBDEFAULTCHARSET=utf8; SELECT*FROMdept; INSERTINTOdeptVALUES(10,'ACCOUNTING','NEW YORK'); ...
错误信息:Exception in thread "main" org.apache.spark.sql.catalyst.analysis.NoSuchTableException: Table or view 'emp' not found in database 'test1'; 解决方案: 需要将hive-site.xml这个文件拷贝到resource下。 问题解决!!... 查看原文 使用hivecontext 查询表 Spark_sbmit 提交作业时报错 ...
(1)E(ntire database), (2)U(sers), or (3)T(ables): (2)U > 3 Export table data (yes/no): yes > 回车 Compress extents (yes/no): yes > 回车 Export done in ZHS16GBK character set and ZHS16GBK NCHAR character set About to export specified tables via Conventional Path ... ...
--dept表 DROP TABLE DEPT; CREATE TABLE DEPT (DEPTNO NUMBER(2) CONSTRAINT PK_DEPT PRIMARY KEY, DNAME VARCHAR2(14), LOC VARCHAR2(13) ); INSERT INTO DEPT VALUES (10,'ACCOUNTING','NEW YORK'); INSERT ...
通过T-SQL语句修改表约束,在表employee加入CHECK约束:输入的员工编号必须以E开头的5位数编号,性别只能为M/F。(4分)A. LTER TABLE employee ADD CONSTRAINT c1 CHECK(emp_no LIKE ('E[0-9][0-9][0-9][0-9]'))B. LTER TABLE employee ADD CONSTRAINT c2 CHECK(sex IN (‘M’,’F’)) 相关知识点...
drop table if exists `employees` ; CREATE TABLE `dept_manager` ( `dept_no` char(4) NOT NULL, `emp_no` int(11) NOT NULL, `from_date` date NOT NULL, `to_date` date NOT NULL, PRIMARY KEY (`emp_no`,`dept_no`)); CREATE TABLE `employees` ( ...