match and index
= INDEX (Data Source B:! B, MATCH (query A2, the data sources A:!! A, 0))
= INDEX (Data Source A:!! A, MATCH (Query 2 A2, Data Source B:! B, 0))
= VLOOKUP ($ A3, Data Source $ A:! $ K, MATCH (returns the results of multi-column B $ 2, the data source $ A $ 1:!! $ K $ 1,0), 0)
= VLOOKUP ($ D4, the data source $ A: $ K, COLUMN () - 3,0!)