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feat: update sql solution to lc problem: No.1322 (doocs#1815)

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+14

-36

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Lines changed: 5 additions & 10 deletions

Original file line number	Diff line number	Diff line change
`@@ -83,16 +83,11 @@ Ads 表:`
`83`	`83`
`84`	`84`	```sql
`85`	`85`	`SELECT`
`86`		`- ad_id,`
`87`		`- IFNULL(ROUND(AVG(CASE`
`88`		`- WHEN action = 'Clicked' THEN 1`
`89`		`- WHEN action = 'Viewed' THEN 0`
`90`		`- ELSE NULL`
`91`		`- END) * 100, 2), 0) AS ctr`
`92`		`-FROM ads`
`93`		`-GROUP BY ad_id`
`94`		`-ORDER BY ctr DESC,`
`95`		`-ad_id ASC;`
	`86`	`+ ad_id,`
	`87`	`+ ROUND(IFNULL(SUM(action = 'Clicked') / SUM(action IN ('Clicked', 'Viewed')) * 100, 0), 2) AS ctr`
	`88`	`+FROM Ads`
	`89`	`+GROUP BY 1`
	`90`	`+ORDER BY 2 DESC, 1;`
`96`	`91`	```
`97`	`92`
`98`	`93`	`<!-- tabs:end -->`

Lines changed: 5 additions & 10 deletions

Original file line number	Diff line number	Diff line change
`@@ -76,16 +76,11 @@ Note that we do not care about Ignored Ads.`
`76`	`76`
`77`	`77`	```sql
`78`	`78`	`SELECT`
`79`		`- ad_id,`
`80`		`- IFNULL(ROUND(AVG(CASE`
`81`		`- WHEN action = 'Clicked' THEN 1`
`82`		`- WHEN action = 'Viewed' THEN 0`
`83`		`- ELSE NULL`
`84`		`- END) * 100, 2), 0) AS ctr`
`85`		`-FROM ads`
`86`		`-GROUP BY ad_id`
`87`		`-ORDER BY ctr DESC,`
`88`		`-ad_id ASC;`
	`79`	`+ ad_id,`
	`80`	`+ ROUND(IFNULL(SUM(action = 'Clicked') / SUM(action IN ('Clicked', 'Viewed')) * 100, 0), 2) AS ctr`
	`81`	`+FROM Ads`
	`82`	`+GROUP BY 1`
	`83`	`+ORDER BY 2 DESC, 1;`
`89`	`84`	```
`90`	`85`
`91`	`86`	`<!-- tabs:end -->`

Lines changed: 4 additions & 16 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,19 +1,7 @@`
`1`	`1`	`# Write your MySQL query statement below`
`2`	`2`	`SELECT`
`3`	`3`	`ad_id,`
`4`		`- IFNULL(`
`5`		`- ROUND(`
`6`		`- AVG(`
`7`		`- CASE`
`8`		`- WHEN action = 'Clicked' THEN 1`
`9`		`- WHEN action = 'Viewed' THEN 0`
`10`		`- ELSE NULL`
`11`		`- END`
`12`		`- ) * 100,`
`13`		`- 2`
`14`		`- ),`
`15`		`- 0`
`16`		`- ) AS ctr`
`17`		`-FROM ads`
`18`		`-GROUP BY ad_id`
`19`		`-ORDER BY ctr DESC, ad_id ASC;`
	`4`	`+ ROUND(IFNULL(SUM(action = 'Clicked') / SUM(action IN ('Clicked', 'Viewed')) * 100, 0), 2) AS ctr`
	`5`	`+FROM Ads`
	`6`	`+GROUP BY 1`
	`7`	`+ORDER BY 2 DESC, 1;`

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