Oracle/SQL - Join one table multiple times to the same table -


i'm trying wrap brain around query , hoping can help. have 2 tables: customer_table , product_table this

name    sku_num1    sku_num2    sku_num3    sku_num4 ----------------------------------------------------     bob               b           c           d frank   e           tom     g shelly  g           e justin  e           g            sku_num     widget_name -------------------           widget_a b           widget_b c           widget_c d           widget_d

so want return list of customers have @ least 1 product sku appears in product table. above information receive records for

bob

frank

justin

any ideas how this?

there no need join 1 table twice:

select * customers sku_num1 in (select sku_num                    product_table)    or sku_num2 in (select sku_num                    product_table)    ....

the reason why need multiple conditions full table scan on product_table wrong database design. products customer bought should not go multiple columns in customer table. instead should have third table n:m relation between customer , products.


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