How to union the table with the 3 different tables columns

Question

Here it is my SQL queries

how to union the 3 tables

 

SELECT

*

FROM [ERS].[dbo].[Transactiond] TD

union

[ERS].[dbo].[Transactionb] TB ON TD.[Transaction No]=TB.[TransactionNo]

union

[ERS].[dbo].[Transactionh] TT ON TDC.[Transaction No]=TT.TransactionNo

 

please help me this

thanks