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Number of Unique Subjects Taught by Each Teacher

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	`1`	`+Link: https://leetcode.com/problems/number-of-unique-subjects-taught-by-each-teacher/`
	`2`	`+Tool: MS SQL Server`
	`3`	`+`
	`4`	`+`
	`5`	`+`
	`6`	`+`
	`7`	`+`
	`8`	`+`
	`9`	`+`
	`10`	`+`
	`11`	`+select distinct teacher_id, count(distinct subject_id) as cnt`
	`12`	`+from Teacher`
	`13`	`+group by teacher_id`

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