Tom Hart wrote:
Let me preface this by saying hello SQL list, and I'm an idiot. My SQL
knowledge is advanced to the point of being able to use a WHERE clause
basically, so I appreciate your business. Now on to my issue
I have 3 tables I'm trying to use in this query: loan, share and draft
(for those of you not familiar with credit unions, share and draft are
savings and checking accounts). What I'm trying to do is get a list of
all loans that were charged off (ln_chgoff_dt > 0), and any share and
draft accounts that have the same account number. My query looks
something like this
SELECT ln_acct_num, ln_num, ln_chrgoff_dt, ln_chrgoff_amt, sh_balance,
sh_stat_cd, df_balance, df_stat_cd
FROM loan
LEFT OUTER JOIN share ON loan.ln_acct_num = share.sh_acct_num
LEFT OUTER JOIN draft ON loan.ln_acct_num = draft.df_acct_num
WHERE
ln_chrgoff_dt > 0
AND loan.dataset = 0
AND share.dataset = 0
AND draft.dataset = 0
;
try
AND (share.dateset = 0 OR share.dataset IS NULL)
AND (draft.dataset = 0 OR draft.dataset IS NULL)
because when the left join is utilized, the dateset field will be a
null, which is not =0 and hence would fail the AND clause in your version
Terry
Now the query
SELECT * FROM loan WHERE ln_chrgoff_dt > 0 AND loan.dataset = 0
returns 139 rows. Shouldn't the first query return at least that many?
My understanding is that a LEFT OUTER JOIN will not drop any records
that are only found in the first table, regardless of whether they
match records on the second or third table. I end up with 14 results
with the first query. I know I'm doing something wrong, but I'm not
sure what. Anybody have a helpful kick in the right direction for me?
Thanks in advance.
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