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- A self-join can be an inner join or an outer join. 自聯接可以是內部聯接,也可以是外部聯接。
- A type of outer join in which all rows from the left-most table in the JOIN clause are included. 一種外部聯接,其中包括JOIN子句中最左側表中的所有行。
- SELECT TOP 1 * FROM T1 LEFT OUTER JOIN T2 ON T1.Id = T2.ParentId ORDER BY T1.Id ASC . 版權申明:本站文章均來自網路,如有侵權,請聯繫028-86262244-215,我們收到后立即刪除,謝謝!
- To include all sales persons in the results, regardless of whether they are assigned a territory, use an SQL-92 right outer join. 若要在結果中包括所有銷售人員,不論是否為他們分配了區域,請使用SQL-92右外部聯接。
- Outer join in which all rows from the table represented on the right will be included, even if they do not have matches in the related table. 在外部聯接中將包括右邊表中所有行,即使它們在相關的表中沒有匹配項。
- You can include a WHERE clause with a full outer join to return only the rows where there is no matching data between the tables. 您可以在完全外部聯接中包括WHERE子句,僅返回兩表之間沒有匹配數據的行。
- If you select the Left outer join type, you can click Swap Inputs to switch the inputs and convert the left outer join to a right outer join. 如果選擇了「左外部聯接」類型,那麼可以單擊「交換輸入」來切換輸入,將左外部聯接轉換為右外部聯接。
- A left outer join is a join that returns each element of the first (left) data source, even if it has no correlated elements in the other data source. 左外部聯接是這樣一種聯接,它返回第一個(左)數據源的每個元素,即使該元素在另一個數據源中沒有關聯元素。
- Null values returned from a base table are also difficult to distinguish from the null values returned from an outer join. 另外,從基表返回的空值與從外部聯接返回的空值很難區分開。
- SQL Server provides the full outer join operator, FULL OUTER JOIN, which includes all rows from both tables, regardless of whether or not the other table has a matching value. SQL Server提供了完全外部聯接運算符FULL OUTER JOIN,它將包括兩個表中的所有行,不論另一個表中是否有匹配的值。
- The following illustration shows a conceptual view of two sets and the elements within those sets that are included in either an inner join or a left outer join. 下圖顯示了一個概念性視圖,其中包含兩個集合以及這兩個集合中的那些包含在內部聯接或左外部聯接中的元素。
- When a self-reference appears within the FROM clause of the recursive subquery, the reference to the recursive table cannot appear on the null-supplying side of an outer join. 當自我引用出現在遞歸子查詢的FROM子句中時,對遞歸表的引用不能出現在外連接的空值提供方。
- CREATE VIEW report.InfoOffice AS SELECT DISTINCT dbo.NTimeout.IP, dbo.NTimeout.msg, dbo.Res.LastUID, dbo.Res.Name, dbo.Res.OS FROM dbo.NTimeout LEFT OUTER JOIN dbo. 另外,我們需要建立一個VIEW從上面兩張表中的到數據,以便Web Page中的ASPX可以快速的顯示數據,而不需即時運算。
- The statement must not contain subqueries, outer joins, or self-joins. 語句不能包含子查詢、外部聯接或自聯接。
- Placing a table on the right or left is significant for outer joins. 將表放在右邊還是左邊對於外連接非常重要。
- Why would I use an outer join? 為什麼使用外部聯接?
- How do I use an outer join? 如何使用外部聯接?
- There are four basic types of joins: inner joins, outer joins, cross joins, and unequal joins. 有四種基本聯接類型:內部聯接、外部聯接、交叉聯接和不等聯接。
- For more information about table ordering with left or right outer joins, see Using Outer Joins. 有關通過左向或右向外部聯接排列的表的詳細信息,請參閱使用外部聯接。
- Most people's faces are asymmetrical. 多數人的臉並不對稱。