sql master sister#2

Author: ggjae

sql/#10.sql

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+-- 코드를 입력하세요
+SELECT count(distinct name) from animal_ins where name is not null

sql/#11.sql

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+-- 코드를 입력하세요
+SELECT name, count(name) from animal_ins where name is not null group by name having count(name) > 1 order by name

sql/#12.sql

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+SELECT hour(datetime) as hour, count(*)
+from animal_outs
+group by hour
+having hour between 9 and 19
+order by hour asc

sql/#9.sql

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+-- 코드를 입력하세요
+SELECT datetime from animal_ins order by datetime limit 1