Suppose you have a tblRoom and tblUserInfo. Now, you need to select all the rooms regardless of whether the room has user information or not. This calls for a LEFT JOIN which will select everything from the LEFT side (the room side) regardless of the join on the right side. Here is the example.Suppose you have a tblRoom and tblUserInfo. No
阅读背景：
Linq 左连接 left join
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