SQL语句查询的相关内容

文章 2017-11-09 来自：开发者社区

SQL语句技巧：查询时巧用OR实现逻辑判断

首先看以下SQL逻辑语句块： DECLARE @fieldname varchar(50) DECLARE @fieldvalue nvarchar(100) SET @fieldname='chassisno' --这里可传入chassisno，plateno，owner，contacttelno其中之一或不传 SET @fieldvalue='Zuowenjun' IF @fi...

问答 2016-07-04 来自：开发者社区

sql语句关于查询上下级部门的问题

部门id 父部门部门名称1 0 局领导2 1 办公室3 2 人事科我现在想查询的是部门为1的局领导部门下的所有的子部门。我能想到的是用递归，就是先查询父部门为1的部门，可以得到部门id=2的 ...

问答 2016-06-16 来自：开发者社区

条件复杂的sql语句查询

有三张表分别为会员表（member）销售表（sale）退货表（regoods）会员表有字段 memberid (会员id，主键） credits(积分);销售表有字段 memberid(会员id ，外键) 购买金额（MNAccount）;退货表中有字段memberid(会员id ，外键) 退货金额（RMNAccount）;业务说明： 1、销售表中的销售记录可以是会员购买，也可是非会员购....

问答 2016-06-16 来自：开发者社区

关于SQL语句查询求助，是否可以实现

类似上面的SQL,查询的savetype会有5种类型，需要这5种数据都有，但是数据库中查出来的可能没有该类型。那么不存在的类型就加上该类型且sums的值设为0。现在要求用sql语句实现，我没办法，这个可以通过sql解决吗？如果有求解决方法

问答 2016-06-16 来自：开发者社区

使用SQL语句写语句查询

1.写函数GetSalaryByNumber，接收员工编号employee_number，返回此员工的工资标准employee_salary。需要建表Employee，列为：employee_number:varchar(10),employee_salary:money。

问答 2016-06-14 来自：开发者社区

sql语句查询，组织机构树查询

现在有一张表，里面有三个字段，code(组织编码) parent(父节点) level(组织等级) 中国 0 国家浙江省中国省江苏省中国省杭州市浙江省市南京市江苏省市西湖区杭州市县/区玄武区南京市县/区现在我要查询这张表，输出结果为code1 code2 code3 西湖区浙江省中国玄武区江苏省中国就是要列出每个level是县的组织，所对应的省和....

问答 2016-06-14 来自：开发者社区

怎样用sql语句，使查询速度更快

在使用数据库的过程中，经常会有10W条甚至100W条级以上的数据记录，使用常规的sql语句在这种级别的数据库中查询，反馈的速度非常慢，时有几分钟才能得到查询反馈的数据结果；本人曾经看过一个sql语句，能在100W级的数据记录中，只用几秒的时间就得到查询结果，但是现在却不曾记得那条语句是如何写的了，不知哪位大神有类似或者这种技能，能否指点小弟一下

问答 2016-02-15 来自：开发者社区

sql语句查询连续的次数，如何做？

LEFT(login_time, 10) login_role_id 登陆角色id 2013-07-01 develop-1 2013-07-02 develop-1 2013-07-04 develop-1 2013-07-05 develop-1 2013-07-06 develop-1 2013-07-08 develop-1 201...

问答 2016-02-11 来自：开发者社区

sql语句查询结果重复的问题

第一句sql语句的查询结果只含有一个元组。。而为什么下个sql语句会有几个重复的呢？

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更新时间 2023-01-12 12:34:30

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云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。

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SQL语句技巧：查询时巧用OR实现逻辑判断

sql语句关于查询上下级部门的问题

条件复杂的sql语句查询

关于SQL语句查询求助，是否可以实现

如何用SQL语句通过1去查询N?

使用SQL语句写语句查询

sql语句查询，组织机构树查询

怎样用sql语句，使查询速度更快

sql语句查询连续的次数，如何做？

sql语句查询结果重复的问题

SQL语句相关内容

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