回答編集履歴
4
加筆修正
answer
CHANGED
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@@ -12,7 +12,7 @@
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12
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値なないことを想定して`coalesce(result.count, 0)`などとします。
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13
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14
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```sql
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15
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-
select d.
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15
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+
select d.ym, coalesce(r.count, 0) as count
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from (
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select to_char(s.a, 'YYYYMM') as ym
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from (
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@@ -27,4 +27,6 @@
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) as r on d.ym = r.ym
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```
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29
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30
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-
で動きますでしょうか。（動作テストできてませんけど。）
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30
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+
で動きますでしょうか。（動作テストできてませんけど。）
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31
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+
2018年のデータだけ集計したいように見えたので、
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32
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+
[date_part(text, timestamp)](https://www.postgresql.jp/document/9.6/html/functions-datetime.html)()を使えば良さそうかなと。
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3
見直し
answer
CHANGED
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@@ -4,7 +4,7 @@
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4
4
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```sql
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5
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select to_char(s.a, 'YYYYMM') as ym
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6
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from (
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7
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select * from generate_series('2018-01-01'::timestamp, '2018-
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7
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select * from generate_series('2018-01-01'::timestamp, '2018-12-01'::timestamp, '+1 month'::interval)
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8
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) as s(a)
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```
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10
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@@ -16,7 +16,7 @@
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from (
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select to_char(s.a, 'YYYYMM') as ym
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from (
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select * from generate_series('2018-01-01'::timestamp, '2018-
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select * from generate_series('2018-01-01'::timestamp, '2018-12-01'::timestamp, '+1 month'::interval)
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) as s(a)
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) as d
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left join (
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2
加筆修正
answer
CHANGED
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@@ -20,9 +20,10 @@
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) as s(a)
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) as d
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left join (
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SELECT to_char(date, 'YYYYMM') as ym, SUM(insert_count) as count
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SELECT to_char(orders.date, 'YYYYMM') as ym, SUM(orders.insert_count) as count
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FROM orders
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WHERE date_part('year', orders.date) = 2018
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-
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GROUP BY to_char(orders.date, 'YYYYMM')
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) as r on d.ym = r.ym
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```
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28
29
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1
見直し
answer
CHANGED
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@@ -4,7 +4,7 @@
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4
4
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```sql
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5
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select to_char(s.a, 'YYYYMM') as ym
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6
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from (
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7
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select * from generate_series('2018-01-01'::timestamp, '2018-
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7
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+
select * from generate_series('2018-01-01'::timestamp, '2018-09-01'::timestamp, '+1 month'::interval)
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8
8
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) as s(a)
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```
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10
10
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@@ -16,7 +16,7 @@
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16
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from (
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select to_char(s.a, 'YYYYMM') as ym
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18
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from (
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select * from generate_series('2018-01-01'::timestamp, '2018-09-01'::timestamp, '+1 month')
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select * from generate_series('2018-01-01'::timestamp, '2018-09-01'::timestamp, '+1 month'::interval)
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20
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) as s(a)
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) as d
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left join (
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