See the line where counter is ZERO?
I'm counting the number of entries in each UNI.However, I do not get a count to 0
I would like to return to be:
UNI Entries
POL 1
GYM 3
XXX 0CREATE TABLE DAN_GR
(ID VARCHAR2(8),
UNI VARCHAR2(8))
INSERT INTO DAN_GR (ID,UNI) VALUES (1,'POL');
INSERT INTO DAN_GR (ID,UNI) VALUES (2,'GYM');
INSERT INTO DAN_GR (ID,UNI) VALUES (3,'GYM');
INSERT INTO DAN_GR (ID,UNI) VALUES (4,'GYM');CREATE TABLE DAN_BANK2
(UNI VARCHAR2(8))
INSERT INTO DAN_BANK2 (UNI) VALUES ('POL');
INSERT INTO DAN_BANK2 (UNI) VALUES ('SYM');
INSERT INTO DAN_BANK2 (UNI) VALUES ('XXX');It looks like a typo in in the sample data; The SYMBOL should have GYM? If so, you get your o/p desired, if not for SYM you will get 0 as count of output.
select uni,
(
select count(b.id) --count(b.id)
from dan_gr b
where b.uni = a.uni
) cnt
from dan_bank2 a;
UNI CNT
-------- ----------------------
POL 1
GYM 3
XXX 0
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Thank you very much for your answer. As always, it is really useful.
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You have not yet responded to what 'large fluctuation' is.
Computers do not work on subjectivity, they work on fixed logic. Tell me that a student who scored 5 in a subject and 20 and 30 on two other subjects has strong fluctuation, but another person may say: "well, the marking is on 500, so 5, 20 and 30 are all a note very low and not really important fluctuation." That is why we must be clear, what you mean by 'high fluctuation'. As in my example, I specified it as the ratio between the minimum and maximum marks in less than 20%, but you have to tell us what the actual logic is desired; not a fluffy subjective idea.
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A written file afiedt.buf1 Select rollno, subject, brands
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4 of)
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13 )
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15 * and min_mark/max_mark< 0.8="" --="" 20%+="" difference="" between="" min="" and="" max="">
SQL > /.
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---------- ---------- --- --- --- ---------- ----------
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