基本sql:在一个查询中多次从同一列中选择AVG()值,当每个想要的AVG()值使用不同的WHERE子句时
I want to get three different average values from one column (value_to_count) inside one table where all of those average values has a different WHERE...
如何在where子句中使用case
I want to get only status = 1 records. But I don't have status column in my table. So I derived the value using CASE... WHEN... THEN. But when I try t...
函数在Where子句中
I found one question answered with the Row_Number() function in the where clause. When I tried one query, I was getting the following error: 我在where子句...
DB2到Oracle转换的基本日期时间列之间的子句
What this is doing is selecting all columns from TABLE where a specific date time column is between last Sunday and this coming Saturday, 7 days total...
PetaPoco:SkipTake 和 Page 中的 OrderBy 子句不支持 “[]” 的解决办法
PetaPoco 的 SkipTake 和 Page 方法内部采用了内联视图,而内联视图是不支持 OrderBy 的,因此 PetaPoco 对传入的 SQL 进行分析,对 OrderBy 子句进行分析和转换,可惜他默认提供的分析机制不能支持这样的语句:SELECT * FROM Articles ...
如何从“select”的“from”子句中动态地生成一个数据集
select * from (select 0 as hour union select 2 union select 4 union select 6 union select 8 union select 10 union select 12 union select 14 union s...
MySQL`INSERT INTO SELECT`子句在唯一字段上生成重复条目错误
I use INSERT INTO SELECT to migrate users' data across databases, but it generates 我使用INSERT INTO SELECT来跨数据库迁移用户的数据,但它会生成 Duplicate entry ' ...
Oracle 11g创建远程物化视图时提示“ORA-01788: 此查询块中要求 CONNECT BY 子句”的解决方案
将远程服务器的一个表映射为本地的一个物化视图,使用下列语句: ----建立测试环境DBLINK:create database link lnk connect to user1 identified by pwd1 using '(DESCRIPTION = (ADDRESS_LIST ...
SQL中的WHERE子句中的LIKE和NULL
I have a store procedure which i have planned to use for search and get all values. 我有一个存储过程,我计划用于搜索并获取所有的值。 Scenario: If the parameter passed is NULL...
排除SQL Server中where子句中的null和其他值
FROM Table1 LLEFT JOIN Table2 M ON L.id = M.id AND ISNULL([Col1], '') NOT IN ('', '#N/A', 'NULL') How do I write this logic in T-S...
使用WHERE子句将数组传递给查询
Given an array of ids $galleries = array(1,2,5) I want to have a SQL query that uses the values of the array in its WHERE clause like: 给定一个id $ galler...
使用NHibernate在WHERE子句中使用NOT IN进行查询
Take this query as an example: 以此查询为例: select * from publisher where id not in ( select publisher_id from record where year = 2008 and month = ...
使用where和group by子句计算sql中的空值
Here is the sample data for test table I have 以下是我所拥有的测试表的示例数据 [childId] [parentId] [present]1 10 02 11 13 NUL...
使用where子句中的select max()函数改进Sql查询
The purpose of this query is to bring back products and their prices for products on sale and the price should be from the date closest but not equal ...
Qt中操作数据库时,给LIKE子句绑定命名占位符的值
Qt中操作数据库时,为提高安全性,防止SQL注入,可以使用命名占位符和位置占位符。 本文以命名占位符为例,演示如何给LIKE子句中的占位符绑定值,代码如下: /*从person表中按工号查找最多limitCnt条人员信息,用于"识别新卡号"界面使用****no :需要查询的工号**rslt :查询...
使用子选择和值列表的子句中的MySQL
I have two levels of filtering I need to do on some related data. The first query looks something like: 我有两个层次的过滤,我需要做一些相关的数据。第一个查询如下: SELECT t1.fk_id...
当在where子句中使用sleep()时,MySql查询需要太长时间
I have read about sleep(n) function in MySql, which is supposed to sleep for n seconds and return 0 if uninterrupted or 1 if interrupted. 我已经阅读了MySql中...
SQL:in子句,与带有实际数据的in子句相比,查询占用时间过长
I have 3 SQL queries as given: 我给出了3个SQL查询: select student_id from user where user_id =4; // returns 35 从user_id = 4的用户中选择student_id; //返回35 select ...
表连接JOIN,USING子句的使用
表连接分为:CROSS JOIN、INNERT JOIN、OUTER JOIN、SELF JOIN。一、CROSS JOIN 交叉连接 CROSS JOIN连接用于生成两张表的笛卡尔集。1、返回的记录数为两个表的记录数乘积。比如,A表有n条记录,B表有m条记录,则返回n*m条记录。2...
Sql Server:如何在WHERE子句中使用像MAX这样的聚合函数
I want get the maximum value for this record. Please help me: 我想获得此记录的最大值。请帮帮我: SELECT rest.field1 FROM mastertable AS m INNER JOIN ( S...