中关村在线

详解SQL四种连接方式

在Access中实现表连接时，可通过查询设计视图或SQL语句完成。常用连接方式包括内连接（inner join）、左连接（left join）、右连接（right join）和交叉连接（cross join）。本文以Persons和Orders两张表为例，展示各类连接操作的具体应用方法，两表结构与数据内容详见附图 ...
Ars Technica

Settle an argument: SQL update with left join + isnull() vs inner join

I've been in an argument with one of our devs that took an update statement with an inner join and made it a left join (because inner was missing some records somehow in the left table - tableB in ...
中关村在线

SQLServer中join与inner join区别

3、 左连接（left join的简写）会返回左表中的所有记录，即便右表中没有匹配的条目，也会保留左表的每一行数据，右表无对应信息时以空值填充。 4、 内连接通过公共字段匹配的值，将两个表中的相关记录进行组合。 5、 调用方式各异 6、 在FROM子句中使用INNER ...
TechRepublic

SQL JOINs make it easy to find and fix missing data

SQL JOINs make it easy to find and fix missing data Your email has been sent Many people are confused by various JOIN operations supported by SQL. Learn to master the SQL command line with this crash ...