Database has a b c column in table 1, table 2 c d e column of exl has a c in two columns, now in table 1 to convert into a b c d e column to do?

CodePudding user response:

?????????? You big???

CodePudding user response:

What is relationship

CodePudding user response:

refer to the second floor AHUA1001 response:

relationship is what

C is the same

CodePudding user response:

SELECT a, b, c, d, e FROM table 1 AND table 2, exl WHERE table 1. C=table 2. C AND table 1. C=exl. C.