回答編集履歴
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追記
test
CHANGED
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@@ -63,3 +63,99 @@
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64
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65
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（MySQL で NVL を IFNULL に書き換えて試したので Oracle とかで動くかわかりません）
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---
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あぁ、こういうことですか。
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74
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```
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SELECT
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80
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81
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CONCAT(YEAR.VAL,MONTH.VAL) AS 年月,
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82
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83
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NVL(SUM(ORDERS.CNT),0) AS 売上個数
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FROM YEAR JOIN MONTH LEFT JOIN ORDERS
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ON YEAR.VAL = SUBSTR(ORDERS.DAY,1,4)
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AND MONTH.VAL = SUBSTR(ORDERS.DAY,5,2)
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GROUP BY
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92
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年月
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```
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99
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```
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+--------+--------------+
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| 年月 | 売上個数 |
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104
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+--------+--------------+
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107
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| 200001 | 0 |
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| 200002 | 0 |
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111
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| 200003 | 0 |
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| 200004 | 0 |
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| 200005 | 0 |
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| 200006 | 0 |
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| 200007 | 0 |
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120
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| 200008 | 0 |
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| 200009 | 0 |
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| 200010 | 0 |
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| 200011 | 0 |
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| 200012 | 67 |
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| 200101 | 79 |
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| 200102 | 36 |
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| 200103 | 0 |
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| 200104 | 0 |
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| 200105 | 0 |
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| 200106 | 0 |
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| 200107 | 0 |
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| 200108 | 0 |
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| 200109 | 0 |
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| 200110 | 0 |
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| 200111 | 0 |
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| 200112 | 0 |
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154
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+--------+--------------+
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157
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```
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159
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