質問編集履歴
2
結果件数を追加
test
CHANGED
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File without changes
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test
CHANGED
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@@ -205,3 +205,25 @@
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205
205
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)
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206
206
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207
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```
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208
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+
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209
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+
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210
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追記
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212
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213
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---
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214
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+
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215
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table_aの件数は800件、table_bは810件
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216
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+
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217
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+
table_aとtable_bが一致している数790件
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218
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+
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219
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+
1つ目のSQLの実行結果は800件でNULLが入る件数が400件
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220
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+
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221
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+
1つ目のSQLのleft joinをjoinに変更すると790件になります
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222
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+
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223
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+
2つ目のSQLを実行すると10件になります。
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224
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+
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225
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+
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226
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+
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227
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left joinの結果だけがおかしいみたいです。
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228
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+
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229
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+
謎です。。
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1
SQLを追記
test
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test
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@@ -153,3 +153,55 @@
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153
153
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154
154
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155
155
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よろしくお願いします。
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156
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+
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157
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+
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158
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+
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159
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160
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+
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---
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162
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+
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163
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+
not exists句を使ったSQLです、これはうまくいきました
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164
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+
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165
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+
```SQL
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166
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+
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167
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+
select
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168
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+
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169
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+
a.item_code,
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170
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+
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171
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+
a.color,
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172
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+
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173
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+
a.size
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174
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+
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175
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+
from table_a as a
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176
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+
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177
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+
where not exists ( select * from
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178
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+
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179
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+
(select
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180
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+
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181
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+
b.id
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182
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+
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183
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+
i.item_code,
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184
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+
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185
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+
c.color_code,
|
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186
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+
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187
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+
s.size_code
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|
188
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+
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189
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+
from table_b as b
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190
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+
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191
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+
join item as i on b.item_id = i.id
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192
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+
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193
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+
join color as c on b.color_id = c.id
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194
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+
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195
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+
join size as s on b.size_id = s.id
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196
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+
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197
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+
) as b2
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198
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+
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199
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+
where a.item_code = b2.item_code
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200
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+
|
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201
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+
and a.color = b2.color_code
|
|
202
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+
|
|
203
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+
and a.size = b2.size_code
|
|
204
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+
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|
205
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+
)
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206
|
+
|
|
207
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+
```
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