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feat: add sql solution to lc problem: No.1978 (doocs#1774)

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solution/1900-1999/1978.Employees Whose Manager Left the Company
- README.md
- README_EN.md

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Original file line number	Diff line number	Diff line change
`@@ -80,4 +80,12 @@ WHERE b.employee_id IS NULL AND a.salary < 30000 AND a.manager_id IS NOT NULL`
`80`	`80`	`ORDER BY a.employee_id;`
`81`	`81`	```
`82`	`82`
	`83`	+```sql
	`84`	`+# Write your MySQL query statement below`
	`85`	`+SELECT employee_id`
	`86`	`+FROM Employees`
	`87`	`+WHERE salary < 30000 AND manager_id NOT IN (SELECT employee_id FROM Employees)`
	`88`	`+ORDER BY employee_id;`
	`89`	+```
	`90`	`+`
`83`	`91`	`<!-- tabs:end -->`

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Original file line number	Diff line number	Diff line change
`@@ -72,4 +72,12 @@ WHERE b.employee_id IS NULL AND a.salary < 30000 AND a.manager_id IS NOT NULL`
`72`	`72`	`ORDER BY a.employee_id;`
`73`	`73`	```
`74`	`74`
	`75`	+```sql
	`76`	`+# Write your MySQL query statement below`
	`77`	`+SELECT employee_id`
	`78`	`+FROM Employees`
	`79`	`+WHERE salary < 30000 AND manager_id NOT IN (SELECT employee_id FROM Employees)`
	`80`	`+ORDER BY employee_id;`
	`81`	+```
	`82`	`+`
`75`	`83`	`<!-- tabs:end -->`

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