Exclusive results from query

Question

CUSTOMER_ID            NAME
100                   ANDREW
200                   JAMES
300                   SMITH
400                   STEPHEN
500                   OSCAR
600                   JEAN
700                   PADILLA
800                   ROMANO
ADDR_ID                  ADDR1          CITY          STATE         ZIP_CODE       CUSTOMER_ID
110               ANDY ST             ABCD          PA          17102          100
111               AY ST          BCD          NJ          08837          100
112               NDY ST          ABCDE          NM          87102          100
210               BW1 ST          ABCD1          NJ          08837          200
211               BW2 ST          ABCD2          OH          81837          200
212               BW3 ST          ABCD3          SC          91837          200
213               BW4 ST          ABCD4          NC          21837          200
214               BW5 ST          ABCD5          NJ          08837          300
215               BW6 ST          ABCD6          OH          81837          300
216               BW7 ST          ABCD7          SC          91837          300
217               BW8 ST          ABCD8          PA          21837          300
218               BW9  ST             ABCD9          NJ          08817          400
219               BW10 ST             ABCD10             NY          81837          400
220               BW11 ST             ABCD11             LA          91837          400
221               BW12 ST             ABCD12             CA          21837          400
222               BW13 ST             ABCD13             NJ          08817          500
223               BW14 ST             ABCD14             NY          81837          500
224               BW15 ST             ABCD15             LA          91837          500
225               BW16 ST             ABCD16             CA          21837          500Hello All,
I've the tables above and I want retrieve customers who have lived exclusively outside of a given state (SAY Pennsylvania), which means my query should return Customers with IDs 200, 400 and 500
I've written the following query:
SELECT TA.CUSTOMER_ID, TA.STATE FROM T_CUSTOMER TC, T_ADDR TA
WHERE TC.CUSTOMER_ID = TA.CUSTOMER_ID AND
TA.CUSTOMER_ID NOT IN (SELECT TA.CUSTOMER_ID FROM T_ADDR TA WHERE UPPER(STATE)='PA') AND
TA.CUSTOMER_ID IN (SELECT TA.CUSTOMER_ID FROM T_ADDR TA WHERE UPPER(STATE)!='PA');This query retrieves the results , but I want to know :
1) Is this query by itself good enough , in terms of performance, because I'm going to hit tables that have millions of records (assume that all the proper indexes are in place)
2) Is there a better way of writing this query?
To make it easier to look at the data, here is where all the customers have lived:
100     NJ,     NM,     PA
200     NC,     NJ,     OH,     SC
300     NJ,     OH,     PA,     SC
400     CA,     LA,     NJ,     NY
500     CA,     LA,     NJ,     NYSo, since customer_ids 100 & 300 have lived in PA , I don't want those in the results.
Thanks in advance
Shravan

Answer 1

@Solomon - Many Thanks for suggesting an alternative way. I think this is what I was looking for.
@rp0248
Why does it matter? See answer to first question above. Because, if you see the way I've written the query compared to what Solomon had come up with, my query needs to run two almost similar inner queries
SELECT TA.CUSTOMER_ID FROM T_ADDR TA WHERE UPPER(STATE)='PA' and
SELECT TA.CUSTOMER_ID FROM T_ADDR TA WHERE UPPER(STATE)!='PA' twice and then compare the result sets ,
where as solomon's query would fetch one result set and will just do the counting.
So, in my opinion(and I'm not even average in SQL development skills), I would think my query would possibly take longer given all other conditions like the one you mentioned (stats, indexes etc.,) are met.
I guess I've used wrong word 'performance' in my question. I'm looking for alternative ways of writing my query that would possibly have less no. of reads /computes /comparisons.
Please read the FAQ at the top of the thread list for 'How to post a tuning request' and for the info needed.I definitely will. Thanks