Answer / vinu

select decode (col1,'a','a','b','b','others') col1,count(col1) from T1 group by decode (col1,'a','a','b','b','others')

Answer / manas

select col1,count(*)cnt from T1 group by col1

Answer / vikneswaran

select decode(col1,'a','a','b','b','Other') "col1",count
(col1) "countval"
from col group by decode(col1,'a','a','b','b','Other');

Answer / rakesh prasad

select name ,count(name)as cnt from (
select case when ((name ='a') or (name = 'b') )then name
else
'others' end as 'name' from tbl_count ) as temp group by
name

Answer / sandhya

SELECT col1, count(*) cnt
FROM T1
GROUP BY col1
ODER BY col1

Answer / vivek nagarajan

SELECT SUM(DECODE(txt,'a',1)) a_count,
SUM(DECODE(txt,'b',1)) b_count,
SUM(DECODE(txt,'a',0,'b',0,1)) others_count
FROM t1;

Answer / kumarvijay

select decode(dept_id,1,1,2,2,0) "cnt" ,count(decode
(dept_id,1,1,2,2,0))
from deps group by decode(dept_id,1,1,2,2,0);

Answer / sankarapandian

SELECT SUM(case when col1='a' then 1 else 0 end) a_count,
SUM(case when col1='b' then 1 else 0 end)
b_count,
sum(case when col1!='a' and col1!='b' then 1
else 0 end)other_count
FROM t1

Answer / vikneswaran

select decode(col1,'a','a','b','b','Other') "col1",count
(col1) "countval"
from col group by col1;

Answer / purushotham

SELECT PROD_CODE ,COUNT(1) FROM TFT_P_PROD WHERE
BRCH_CODE='784'
GROUP BY PROD_CODE;

What is pseudo column ?

6 Answers   ABB,

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Hi All, I am new to both this blog and technology. I was able to see a response for one of the questions on triggers as below. I would like to know why are we using " if rtrim(to_char(sysdate,'day'))=rtrim('sunday') then" instead, can't we use " if sysdate = 'sunday' then". I can understand the use of "rtrim", but dont know y v r using to_char. I have seen this in many cases but did not get a convincible explaination. Please help me with this and do excuse if this question sounds silly. Thanks in advance...... create or replace trigger trg_sun before insert on <table name> begin if rtrim(to_char(sysdate,'day'))=rtrim('sunday') then raise_application_error(-20345,'no transaction in sunday'); end if; end trg_sun;

2 Answers