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feat: add sql solution to lc problem: No.2084 (doocs#1881)

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solution/2000-2099/2084.Drop Type 1 Orders for Customers With Type 0 Orders
- README.md
- README_EN.md

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Original file line number	Diff line number	Diff line change
`@@ -92,4 +92,15 @@ FROM Orders AS o`
`92`	`92`	`WHERE order_type = 0 OR NOT EXISTS (SELECT 1 FROM T AS t WHERE t.customer_id = o.customer_id);`
`93`	`93`	```
`94`	`94`
	`95`	+```sql
	`96`	`+SELECT DISTINCT`
	`97`	`+ a.order_id,`
	`98`	`+ a.customer_id,`
	`99`	`+ a.order_type`
	`100`	`+FROM`
	`101`	`+ Orders AS a`
	`102`	`+ LEFT JOIN Orders AS b ON a.customer_id = b.customer_id AND a.order_type != b.order_type`
	`103`	`+WHERE b.order_type IS NULL OR b.order_type = 1;`
	`104`	+```
	`105`	`+`
`95`	`106`	`<!-- tabs:end -->`

Lines changed: 11 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -88,4 +88,15 @@ FROM Orders AS o`
`88`	`88`	`WHERE order_type = 0 OR NOT EXISTS (SELECT 1 FROM T AS t WHERE t.customer_id = o.customer_id);`
`89`	`89`	```
`90`	`90`
	`91`	+```sql
	`92`	`+SELECT DISTINCT`
	`93`	`+ a.order_id,`
	`94`	`+ a.customer_id,`
	`95`	`+ a.order_type`
	`96`	`+FROM`
	`97`	`+ Orders AS a`
	`98`	`+ LEFT JOIN Orders AS b ON a.customer_id = b.customer_id AND a.order_type != b.order_type`
	`99`	`+WHERE b.order_type IS NULL OR b.order_type = 1;`
	`100`	+```
	`101`	`+`
`91`	`102`	`<!-- tabs:end -->`

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