solve question 37

Author: a97410985

MySol/Consecutive available seats.md

@@ -0,0 +1,24 @@
+把資料庫建起來的SQL
+```SQL
+CREATE table available_seats_37 (
+    seat_id int auto_increment, 
+    free    bool,
+    PRIMARY KEY (seat_id)
+);
+
+INSERT INTO available_seats_37
+(free)
+VALUES
+(1),(0),(1),(1),(1);
+```
+
+查詢的SQL
+```SQL
+select distinct a.seat_id from available_seats_37 as a 
+join available_seats_37 as b 
+where b.seat_id = a.seat_id + 1 and b.free = 1 and a.free = 1 or
+      b.seat_id = a.seat_id - 1 and b.free = 1 and a.free = 1 
+order by seat_id;
+```
+這是一個很醜，而且效能應該非常差的寫法。
+畢竟where的條件判定會每一個row都做一次，條件判定的重複性太多，多了一個`or`