# 横向显示

1、无求和运算
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SELECT a.sno,
MAX (CASE WHEN b.cname = 'c' THEN c.score ELSE NULL END)
"c语言成绩",
MAX (CASE WHEN b.cname = 'j' THEN c.score ELSE NULL END)
"j语言成绩",
MAX (CASE WHEN b.cname = 'd' THEN c.score ELSE NULL END)
"d语言成绩"
FROM student a, course b, score c
WHERE a.sno = c.sno AND b.cno = c.cno
GROUP BY a.sno;

SNO   c语言成绩   j语言成绩   d语言成绩
----- ----------- ----------- -----------
1          87          98          85
2          85                      95
3                      87
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SELECT sno
FROM (  SELECT a.sno,
MAX (CASE WHEN b.cname = 'c' THEN c.score ELSE NULL END) c,
MAX (CASE WHEN b.cname = 'j' THEN c.score ELSE NULL END) j,
MAX (CASE WHEN b.cname = 'd' THEN c.score ELSE NULL END) d,
MAX (CASE WHEN b.cname = 's' THEN c.score ELSE NULL END) s
FROM student a, course b, score c
WHERE a.sno = c.sno AND b.cno = c.cno
GROUP BY a.sno)
WHERE c IS NOT NULL AND j IS NOT NULL AND d IS NOT NULL AND s IS NOT NULL;
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select a.cust_no,
a.name,
a.dis_no,
a.cust_type_no,
max (
case when b.cardholder_no = 1 then b.cardholder_name else null end)
name1,
max (
case when b.cardholder_no = 1 then b.mobile_phone_no else null end)
phone1,
max (
case when b.cardholder_no = 2 then b.cardholder_name else null end)
name2,
max (
case when b.cardholder_no = 2 then b.mobile_phone_no else null end)
phone2,
max (
case when b.cardholder_no = 3 then b.cardholder_name else null end)
name3,
max (
case when b.cardholder_no = 3 then b.mobile_phone_no else null end)
phone3,
max (
case when b.cardholder_no = 4 then b.cardholder_name else null end)
name4,
max (
case when b.cardholder_no = 4 then b.mobile_phone_no else null end)
phone4,
max (
case when b.cardholder_no = 5 then b.cardholder_name else null end)
name5,
max (
case when b.cardholder_no = 5 then b.mobile_phone_no else null end)
phone5
from cust a, cardholder b
where a.cust_no = b.cust_no and a.cust_no in ()
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2、有求和运算
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select distinct
b.dept_no,
sum (
case
when c.move_date like sysdate - 318 then c.sales_amnt
else 0
end)
sales_1,
sum (
case
when c.move_date like sysdate - 317 then c.sales_amnt
else 0
end)
sales_2
from article a, art_grp b, art_movement c
where     a.art_grp_no = b.art_grp_no
and a.art_no = c.art_no
and c.move_kind = 7
group by b.dept_no;
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3、条件
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select b.dept_no,
a.art_grp_no,
a.art_no,
a.descr,
a.suppl_no,
a.sell_pr,
a.stock,
a.on_order,
a.dms,
a.last_delday,
a.last_saleday,
sum (case when c.move_kind = 7 then c.move_qty else 0 end) move_qty,
sum (c.sales_amnt)
from article a, art_grp b, art_movement c
where     a.art_grp_no = b.art_grp_no
and a.art_no = c.art_no
and b.dept_no in (11, 12, 13)
and c.move_date between '20081108' and '20081109'
group by b.dept_no,
a.art_grp_no,
a.art_no,
a.descr,
a.suppl_no,
a.sell_pr,
a.stock,
a.on_order,
a.dms,
a.last_delday,
a.last_saleday
order by b.dept_no,
a.art_grp_no,
a.suppl_no,
a.art_no;
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1、无求和运算
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select a.time_zone,
a.dis_no,
a.cust_no,
a.name,
max (decode (b.cardholder_no, 1, b.cardholder_name)) n1,
max (decode (b.cardholder_no, 2, b.cardholder_name)) n2,
max (decode (b.cardholder_no, 3, b.cardholder_name)) n3,
max (decode (b.cardholder_no, 4, b.cardholder_name)) n4,
max (decode (b.cardholder_no, 5, b.cardholder_name)) n5
from cust a, cardholder b
where a.cust_no = b.cust_no and a.reg_date like sysdate - 1
group by a.time_zone,
a.dis_no,
a.cust_no,
a.name;
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2、有求和运算
---------------------------------------------------------------------------
select b.dept_no,
sum (
decode (c.move_date,
to_date ('20080101', 'yyyymmdd'), c.sales_amnt))
amnt1,
sum (
decode (c.move_date,
to_date ('20080102', 'yyyymmdd'), c.sales_amnt))
amnt2
from article a, art_grp b, art_movement c
where     a.art_grp_no = b.art_grp_no
and a.art_no = c.art_no
and c.move_kind = 7
group by b.dept_no;
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---------------------------------------------------------------------------
select b.dept_no,
a.art_grp_no,
a.art_no,
a.descr,
sum (
case
when c.move_date = to_date ('20090801', 'yyyymmdd')
then
c.move_qty
else
0
end)
qty0801,
sum (
case
when c.move_date = to_date ('20090801', 'yyyymmdd')
then
c.sales_amnt
else
0
end)
amnt0801,
sum (
case
when c.move_date = to_date ('20090811', 'yyyymmdd')
then
c.move_qty
else
0
end)
qty0811,
sum (
case
when c.move_date = to_date ('20090811', 'yyyymmdd')
then
c.sales_amnt
else
0
end)
amnt0811
from article a,
art_grp b,
(select *
from art_movement
where move_date = to_date ('20090801', 'yyyymmdd') and move_kind = 7
union
select *
from art_movement
where move_date = to_date ('20090811', 'yyyymmdd') and move_kind = 7) c
where a.art_grp_no = b.art_grp_no and a.art_no = c.art_no
group by b.dept_no,
a.art_grp_no,
a.art_no,
a.descr
order by b.dept_no,
a.art_grp_no,
a.art_no,
a.descr;
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