'1','韩梅梅');INSERTINTO`choose_course`VALUES('语文','1','露西');INSERTINTO`choose_course`VALUES('语文','2','莉莉');INSERTINTO`choose_course`VALUES('语文','2','格林');INSERTINTO`choose_course`VALUES('数学','1','李雷');INSERTINTO`choose_course`VALUES('数学','1','名字真...
代码语言:sql 复制 SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'your_table_name' 代码语言:txt 复制 这将返回有关指定表的详细信息,例如表名、所属架构、行数等。 使用sys表: sys表是SQL Server系统表,包含了许多有关数据库对象的信息。要查询表元数据,可以使用以下查询: 代码语言:sql ...
"touchdown" real[] NOT NULL, CONSTRAINT "destis_einzig" UNIQUE ("einzig") ) WITH (oids = false); 上面是该表的简化版本——我跳过了不相关的字段条目。我想运行一个周期性的CRON作业,更新表中每一行center列标识的每个不同位置的天气数据(存储在Redis上)。 这里的问题在于这个词——与众不同。在一...
createtableuser(idintunsignedprimarykeynotnullauto_increment, namevarchar(50) UNIQUEnotnull, agetinyintnotnull, sex enum('M','W')notnull)engine=INNODBdefaultcharset=utf8; 插入数据: insertintouser(name,age,sex)values('zhang san',22,'M'),('li si',21,'M'),('wang wu',22,'W'),('er...
SQL Copy SELECT FirstName, LastName, BaseRate, BaseRate * 40 AS GrossPay FROM DimEmployee ORDER BY LastName; C. Use DISTINCT with SELECT The following example uses DISTINCT to generate a list of all unique titles in the DimEmployee table. SQL Copy SELECT DISTINCT Title FROM DimEmployee...
SQL SELECTFirstName, LastName, BaseRate, BaseRate *40ASGrossPayFROMDimEmployeeORDERBYLastName; C. Use DISTINCT with SELECT The following example usesDISTINCTto generate a list of all unique titles in theDimEmployeetable. SQL SELECTDISTINCTTitleFROMDimEmployeeORDERBYTitle; ...
Re: How to limit SELECT results to unique values Tom Arnold May 27, 2014 04:16PM Re: How to limit SELECT results to unique values Phillip Ward May 28, 2014 05:04AM Sorry, you can't reply to this topic. It has been closed.Content...
在开始之前,我们首先需要导入一个数据库来测试我们的转换方法。你可以使用以下SQL语句在SQL Server中创建一个测试表: CREATETABLETestTable(ID uniqueidentifierPRIMARYKEY,Name nvarchar(50))INSERTINTOTestTable(ID,Name)VALUES('2C4E76A0-CE8E-4CB6-80DA-4D9A889DF880','John') ...
SELECT UNIQUE City FROM Person As you can see, I have inserted a total of 5 rows so there is a total of 5 names in the column Name. Two names “Manvendra” and “Kunal” has been repeated so when we run SQL SELECT UNIQUE statement on this column, it should return unique values whic...
CONSTRAINTUQ_JNOrder_OrderNoUNIQUE(OrderNo) ); 2)插入数据 INSERTALL --用户数据 INTOJNUserVALUES(1,‘孙器璇‘,2,17, to_date(‘2002/11/18‘,‘yyyy/mm/dd‘),‘北京‘,‘17730094858437637X‘,10400,‘hello‘) INTOJNUserVALUES(2,‘周器璇‘,0,22, to_date(‘1966/05/12‘,‘yyyy/mm/dd‘...