回答編集履歴
5
訂正
test
CHANGED
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@@ -26,7 +26,7 @@
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26
26
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27
27
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select b1.column1, max(b2.column1) as b2_column1
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28
28
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29
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-
from before b1 left join befor b2
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29
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+
from before b1 left join before b2
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30
30
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31
31
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on b1.column1 > b2.column
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32
32
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4
訂正
test
CHANGED
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@@ -40,7 +40,7 @@
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40
40
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41
41
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on b3.column1 = b4.column1
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42
42
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43
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-
left join befor b5
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43
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+
left join before b5
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44
44
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45
45
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on b3.b2_column1 = b5.column1
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46
46
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3
訂正
test
CHANGED
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@@ -42,6 +42,6 @@
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42
42
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43
43
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left join befor b5
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44
44
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45
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-
on b
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45
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+
on b3.b2_column1 = b5.column1
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46
46
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47
47
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```
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2
訂正
test
CHANGED
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@@ -20,11 +20,9 @@
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20
20
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21
21
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```SQL
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22
22
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23
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-
select b3.column1, coalesce(b
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23
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+
select b3.column1, coalesce(b4.column2, b5.column2) column2
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24
24
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25
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-
from
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25
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+
from (
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26
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-
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27
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-
left join (
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28
26
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29
27
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select b1.column1, max(b2.column1) as b2_column1
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30
28
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@@ -36,8 +34,14 @@
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36
34
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37
35
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group by b1.column1
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38
36
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39
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-
) b
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37
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+
) b3
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38
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+
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39
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+
inner join before b4
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40
40
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41
41
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on b3.column1 = b4.column1
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42
42
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43
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+
left join befor b5
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44
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+
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45
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+
on b4.b2_column1 = b5.column1
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46
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+
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43
47
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```
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1
追記
test
CHANGED
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@@ -5,3 +5,39 @@
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5
5
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6
6
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7
7
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並びを特定する項目が無いなら、そのテーブルにオートナンバーを付加したテーブルを準備して追加すると、上手く行けば見た目上の並びでオートナンバーが振られるかもしれません。
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8
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+
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9
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+
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10
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+
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11
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+
追記
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12
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+
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13
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+
--
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14
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+
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15
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+
未検証です。
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16
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+
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17
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+
column1はユニークであることが前提です。
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18
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+
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19
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+
低速な場合はせめてcolumn1のインデックスを作成して下さい。
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20
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+
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21
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+
```SQL
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22
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+
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23
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+
select b3.column1, coalesce(b3.column2, b4.column2) column2
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24
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+
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25
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+
from befor b3
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26
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+
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27
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+
left join (
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28
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+
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29
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+
select b1.column1, max(b2.column1) as b2_column1
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30
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+
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31
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+
from before b1 left join befor b2
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32
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+
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33
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+
on b1.column1 > b2.column
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34
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+
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35
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+
and b2.column2 is not null
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36
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+
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37
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+
group by b1.column1
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38
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+
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39
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+
) b4
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40
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+
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41
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+
on b3.column1 = b4.column1
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42
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+
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43
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+
```
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