sas中的sql(4) 多表操作,內連接,外連接(left | right | full/join),In-Line Views,Merge&Join的比較...

Understanding Joins 1.Joins combine tables horizontally (side by side) by combining rows. The tables being joined are not required to have the same number of rows or columns. (被join的表不需要行或列與join表的相同)
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