SQL: JOIN syntax error

Question

I am attempting to eliminate unwanted duplicate query results. The gist is that the field [CUSIP] exists in all tables in question, however, the field [4DTYR] exists in all tabl

Answer 1

In the FROM phase we specify table or tables that need to be queried, and if table operators are specified, this phase processes those operators from left to right. Join (Left / Right) are table operators and each table operator operates on one or two input tables and returns an output table. The result of a table operator is used as the left input to the next table operator—if one exists—and as the input to the next logical query processing phase otherwise. In your query i find two issues:

1. DO you want entire 'AND' condition(Line 15) to be added as a filter condition in ON clause when left joining with DATA_SP?
2. In Last line you are trying to specify a left join on field [4DTYR] of DATA_Footnotes table which is not right as the Left join operator expects a table to be supplied.

I think a pseudo like below might help:

select IDX_FS.CUSIP , DATA_BS.[4DTYR] 
FROM 
  IDX_FS
  LEFT JOIN DATA_BS 
  ON IDX_FS.CUSIP = DATA_BS.CUSIP
  LEFT JOIN DATA_Footnotes 
  ON IDX_FS.CUSIP = DATA_Footnotes.CUSIP AND DATA_BS.CUSIP = DATA_Footnotes.CUSIP  AND DATA_BS.[4DTYR] = DATA_Footnotes.[4DTYR]
  LEFT JOIN DATA_IS 
  ON IDX_FS.CUSIP = DATA_IS.CUSIP AND DATA_BS.CUSIP = DATA_IS.CUSIP AND DATA_BS.[4DTYR] = DATA_IS.[4DTYR]
  LEFT JOIN DATA_SP 
  ON IDX_FS.CUSIP = DATA_SP.CUSIP AND DATA_BS.CUSIP = DATA_SP.CUSIP AND DATA_BS.[4DTYR] = DATA_SP.[4DTYR]
  -- LEFT JOIN DATA_Footnotes.[4DTYR] no need.

Hope this helps!!!