Add 实验7

实验7

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+#实验7
+#1.
+select * from bmxx;
+
+#2.
+select now();
+
+#3.
+select * from spxx where Sslb='文具' and Jg>=80 and Jg<=100;
+
+#4.
+select * from spxx where Sslb='电器' and (Jg<=100 or Jg>=200);
+
+#5.
+select * from ygxx where Name like '刘%' and ssbmbh != '1001';
+
+#6.
+select * from ygxx where Name like '张%' and Sfzh is not null;
+
+#7.
+select Sslb,sum(sl) from spxx group by Sslb having sum(sl)>12; 
+
+#8
+select Spmc,Jg,sl from spxx where Sslb='文具' order by Jg DESC LIMIT 3;