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+第1关:按条件查询单表的所有字段
+1.use province;
+2#代码开始
+select*from jdxx where qxmc="开福区";
+select* from jdxx where qxmc in("开福区","岳麓区");
+select*from jdxx where cs="长沙市" and name="西湖街道";
+#代码结束
+第2关:查询唯一值
+1.use province
+2.#代码开始
+select distinct qxmc from jdxx where sf="湖南省"
+select distinct qxmc from jdxx where cs="长沙市";
+#代码结束
+第3关:统计查询
+1. use province;
+2.#代码开始
+答案1
+select count(name)from jdxx where sf="湖南省";塔案2
+select count(name)from jdxx where cs="长沙市"
+7.答案3
+8.select count(distinct gxmc)from jdxx where sf="湖南省";
+9.答案4
+10.select count(distinct qxmc)from jdxx where cs="长沙市”;
+第4关:分组查询
+use province;
+2.#代码开始
+3.#题目1
+select sf,count(*)from jdxx group by sf;#题目2
+select cs,count(*)from jdxx group by cs having count(*)>200;
+#题目3
+8.select qxmc,count(*)from jdxx where cs="长沙市" group by qxmc;
+第5关:数据排序
+use province;
+#代码开始
+#第-题
+select*from jdtj order by jdgs desc limit 10;
+#第二题
+
+selectfrom jdtj order by jdgs asc limit 10;
+#第三题
+selectfrom jdtj where jdgs>35 order by jdgs desc,sf;
+#代码结束
+
+t2
+
+第1关:nuIl值的判断
+1. use library;
+2.#代码开始
+3. select * from borrow where hsrg is null;
+
+第2关:between and和in运算
+1use library
+#代码开始
+答案1
+select txm,sm,sj from book where sj between 10 and 20;
+答案2
+select txm,sm,cbs from book where cbs not in("中华书局”,"上海古籍出版社”);
+第3关:like运算符
+use library;
+#代码开始
+第一问
+4.select txm,sm from book where sm like"%寺%";
+第二问
+select txm,sm from book where sm like"诗%"
+第4关:逻辑运算符
+use library;1.
+2.#代码开始
+3.第一问
+select *from reader where xb='男'and sf="研究生";
+第二问
+select * from reader where xb='男'and(sf="研究生"or sf="工作人员");
+
+T3
+第1关:数值函数
+use sale;
+2.#代码开始
+第一题笞案
+select gyxm,round(gz*0.05,0)as kf from gzry;
+第二题笞案
+select gyxm,truncate(gz*0.05,0) as kf from gzry;
+第2关:字符串函数一
+.use sale
+2.#代码开始
+3.答案1
+select concat(rpad(bm,4," "),rpad(gyxm,4,""),dh)as ygxx from gzry order by bm;
+6.select gyxm,dh from gzry where left(gyxm,1)="王" and char length(gyxm)=3;
+第3关:字符串函数二
+use sale;1.
+#代码开始
+3.第一问
+select insert(name,2,0,space(2*(3-char length(name))) as xm from gk;
+第二问select name,concat(left(tel,3),"_",mid(tel,4,4),"_",right(tel,4))as dh from gk;0.
+第三问
+8.update gk set dept=replace(dept,"新一佳”,"佳惠”);
+18.select name,dept from gk;
+第4关:日期函数
+use sale;
+#代码开始2
+3.答案1
+4.select month(xsrg)as yf,sum(sjfk)as sije from xsd where year(xsrg)=2015 group by month(xsrg);
+5. use library;
+答案2
+6.select dzzh,(datediff(hsrg,jyrg)-30)*sj*,01 as fk from borrow,book
+where book.txm=borrow.txm
+and datediff(hsrg,jyrg)>30;
+第5关:条件函数
+.use sa1e:
+#代码开始2.
+第一题3.
+4. select gyxm,if(gz<2000,50,100)as jq from gzry;
+第二题5.
+6.select gyxm,case bm when "销售部”then 1000 when "办公室”then 800 when "采购部”then 500 else 380 end as jt from gzry;