美國留學(xué)選擇什么專業(yè)好?留學(xué)美國熱門專業(yè)推薦
2019-06-26
更新時(shí)間:2024-03-23 00:24作者:小編
?一:inner_join是什么意思(中英文)解釋的意思
inner_join是一種數(shù)據(jù)庫操作,用于將兩個(gè)表格中具有相同值的行連接起來,從而創(chuàng)建一個(gè)新的表格。它基于兩個(gè)表格之間的共同列,只保留兩個(gè)表格中都存在的數(shù)據(jù)行。
Inner join is a type of database operation that combines rows from two tables based on a common column, creating a new table. It only keeps the rows that have matching values in both tables.
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Inner join通常在SQL語句中使用,可以使用關(guān)鍵字INNER JOIN或簡寫為JOIN來表示。它與其他類型的連接操作(如left join和right join)相比,更嚴(yán)格地篩選數(shù)據(jù),只保留兩個(gè)表格中都存在的數(shù)據(jù)。
Inner join is typically used in SQL statements, and can be represented by the keywords INNER JOIN or simply JOIN. Compared to other types of join operations (such as left join and right join), it filters data more strictly, only keeping rows that exist in both tables.
1. The inner join between the customers and orders tables resulted in a new table with only the matching customer orders.
內(nèi)部連接顧客和訂單表后得到一個(gè)只包含匹配顧客訂單的新表。
2. The inner join operation is commonly used to combine data from multiple tables into one.
內(nèi)部連接操作通常用于將多張表格的數(shù)據(jù)合并為一張表。
3. Only the rows with matching values in both tables will be included in the result of an inner join.
內(nèi)部連接的結(jié)果只包含兩個(gè)表格中具有相同值的行。
4. In order to perform an inner join, the two tables must have a common column to base the join on.
為了進(jìn)行內(nèi)部連接,兩個(gè)表格必須具有共同的列來作為連接的基準(zhǔn)。
5. The inner join can help to eliminate redundant data and create a more efficient database structure.
內(nèi)部連接可以幫助消除冗余數(shù)據(jù),創(chuàng)建更高效的數(shù)據(jù)庫結(jié)構(gòu)。
Inner join也可以被稱為equi-join,表示它基于相等條件來連接兩個(gè)表格。它與outer join(包括left、right和full outer join)是相對的,outer join會(huì)保留不匹配的數(shù)據(jù)行。
Inner join can also be referred to as equi-join, indicating that it joins two tables based on equality conditions. It is opposite to outer joins (including left, right, and full outer joins), which retain unmatched rows.
Inner join是一種常用的數(shù)據(jù)庫操作,能夠通過共同列將兩個(gè)表格中的數(shù)據(jù)合并起來。它與其他類型的連接操作相比更嚴(yán)格,只保留匹配的數(shù)據(jù)行。使用inner join可以幫助我們更有效地管理和分析大量數(shù)據(jù),并創(chuàng)建高效的數(shù)據(jù)庫結(jié)構(gòu)。