Commit bf78ec4

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feat: update sql solution to lc problem: No.1939 (doocs#1816)

* feat: update sql solution to lc problem: No.1939 * fix: optimize

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Lines changed: 2 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -88,11 +88,10 @@ Result table`
`88`	`88`	`<!-- 这里可写当前语言的特殊实现逻辑 -->`
`89`	`89`
`90`	`90`	```sql
`91`		`-SELECT DISTINCT`
`92`		`- c1.user_id AS user_id`
	`91`	`+SELECT DISTINCT user_id`
`93`	`92`	`FROM`
`94`	`93`	`Confirmations AS c1`
`95`		`- INNER JOIN Confirmations AS c2 ONc1.user_id=c2.user_id`
	`94`	`+ JOIN Confirmations AS c2 USING (user_id)`
`96`	`95`	`WHERE`
`97`	`96`	`c1.time_stamp < c2.time_stamp`
`98`	`97`	`AND TIMESTAMPDIFF(SECOND, c1.time_stamp, c2.time_stamp) <= 24 * 60 * 60;`

Lines changed: 2 additions & 3 deletions

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`@@ -91,11 +91,10 @@ User 7 requested two messages within 24 hours and 1 second of each other, so we`
`91`	`91`	`### SQL`
`92`	`92`
`93`	`93`	```sql
`94`		`-SELECT DISTINCT`
`95`		`- c1.user_id AS user_id`
	`94`	`+SELECT DISTINCT user_id`
`96`	`95`	`FROM`
`97`	`96`	`Confirmations AS c1`
`98`		`- INNER JOIN Confirmations AS c2 ONc1.user_id=c2.user_id`
	`97`	`+ JOIN Confirmations AS c2 USING (user_id)`
`99`	`98`	`WHERE`
`100`	`99`	`c1.time_stamp < c2.time_stamp`
`101`	`100`	`AND TIMESTAMPDIFF(SECOND, c1.time_stamp, c2.time_stamp) <= 24 * 60 * 60;`

Lines changed: 2 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,8 +1,7 @@`
`1`		`-SELECT DISTINCT`
`2`		`- c1.user_id AS user_id`
	`1`	`+SELECT DISTINCT user_id`
`3`	`2`	`FROM`
`4`	`3`	`Confirmations AS c1`
`5`		`- INNER JOIN Confirmations AS c2 ONc1.user_id=c2.user_id`
	`4`	`+ JOIN Confirmations AS c2 USING (user_id)`
`6`	`5`	`WHERE`
`7`	`6`	`c1.time_stamp < c2.time_stamp`
`8`	`7`	`AND TIMESTAMPDIFF(SECOND, c1.time_stamp, c2.time_stamp) <= 24 * 60 * 60;`

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