diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,2 +1,183 @@
 # task1
 
+CREATE DATABASE dg_mysql;
+
+SHOW DATABASES;
+
+USE dg_mysql;
+
+<!--分别创建s、p、j和spj数据表-->
+CREATE TABLE s(
+    sno CHAR(2),
+    sname VARCHAR(10),
+    STATUS INT,
+    city VARCHAR(10)
+);
+CREATE TABLE p(
+    pno CHAR(2),
+    pname VARCHAR(10),
+    color CHAR(1),
+    weight INT
+);
+CREATE TABLE j(
+    jno CHAR(2),
+    jname VARCHAR(10),
+    city VARCHAR(10)
+);
+CREATE TABLE spj(
+    sno CHAR(2),
+    pno CHAR(2),
+    jno CHAR(2),
+    qty INT
+);
+
+
+<!--查看s、p、j和spj数据表的详细结构-->
+DESCRIBE s;
+DESCRIBE p;
+DESCRIBE j;
+DESCRIBE spj;
+
+<!--插入s表数据-->
+INSERT INTO s VALUES
+('S1','精益',20,'天津'),
+('S2','盛锡',10,'北京'),
+('S3','东方红',30,'北京'),
+('S4','丰泰盛',20,'天津'),
+('S5','为民',30,'上海');
+
+<!--插入p表数据-->
+INSERT INTO p VALUES
+('P1','螺母','红',12),
+('P2','螺栓','绿',17),
+('P3','螺丝刀','蓝',14),
+('P4','螺丝刀','红',14),
+('P5','凸轮','蓝',40),
+('P6','齿轮','红',30);
+
+<!--插入j表数据-->
+INSERT INTO j VALUES
+('J1','三建','北京'),
+('J2','一汽','长春'),
+('J3','弹簧厂','天津'),
+('J4','造船厂','天津'),
+('J5','机车厂','唐山'),
+('J6','无线电厂','常州'),
+('J7','半导体厂','南京');
+
+<!--插入spj表数据-->
+INSERT INTO spj VALUES
+('S1','P1','J1',200),
+('S1','P1','J3',100),
+('S1','P1','J4',700),
+('S1','P2','J2',100),
+('S2','P3','J1',400),
+('S2','P3','J2',200),
+('S2','P3','J4',500),
+('S2','P3','J5',400),
+('S2','P5','J1',400),
+('S2','P5','J2',100),
+('S3','P1','J1',200),
+('S3','P3','J1',200),
+('S4','P5','J1',100),
+('S4','P6','J3',300),
+('S4','P6','J4',200),
+('S5','P2','J4',100),
+('S5','P3','J1',200),
+('S5','P6','J2',200),
+('S5','P6','J4',500);
+
+<!--分别查询s、p、j和spj表的所有数据-->
+SELECT* FROM s;
+SELECT* FROM p;
+SELECT* FROM j;
+SELECT* FROM spj;
+
+<!--1. 查询所有供应商的姓名和所在城市（按供应商姓名升序排列）。-->
+
+SELECT sname,city FROM s ORDER BY sname ASC;
+
+<!--#2. 查询所有零件的名称、颜色、重量（按零件名称升序排列）。-->
+SELECT pname,color,weight FROM p ORDER BY pname ASC;
+
+<!--#1. 查询供应工程J1零件的供应商号码(去除重复，按供应商号码升序排列)。-->
+SELECT DISTINCT sno FROM j NATURAL JOIN spj WHERE jno='J1' ORDER BY sno ASC;
+SELECT DISTINCT sno  FROM spj WHERE jno='J1' ORDER BY sno ASC;
+
+<!--#2. 查询供应工程J1零件P1的供应商号码（按供应商号码升序排列）。-->
+SELECT sno FROM spj WHERE jno='J1'AND pno='P1' ORDER BY sno ASC;
+
+<!--#3. 查询使用供应商S1所供应零件的工程号码（按工程号码升序排列）。-->
+ SELECT jno FROM spj WHERE sno='S1' ORDER BY jno ASC;
+ 
+<!--#1. 查询工程项目J2使用的各种零件的名称及其数量（按零件名称升序排列）。-->
+ SELECT pname,qty FROM spj NATURAL JOIN p WHERE jno='J2' ORDER BY pname ASC;
+ 
+<!--#2. 查询上海厂商供应的所有零件号码（去除重复，按零件号码升序排列）。-->
+ SELECT DISTINCT pno FROM s NATURAL JOIN spj WHERE city='上海' ORDER BY pno ASC;
+ 
+<!--#3. 查询使用上海产的零件的工程名称（按工程名称升序排列,去除重复数据）。-->
+SELECT DISTINCT jname FROM j INNER JOIN spj ON j.`jno`=spj.`jno` INNER JOIN s ON spj.`sno`=s.`sno` WHERE s.city='上海' ORDER BY jname ASC;
+ 
+<!--#1. 查询供应工程J1零件为红色的供应商号码（按供应商号码升序排列）。-->
+SELECT sno FROM p NATURAL JOIN spj WHERE jno='J1'AND color='红' ORDER BY sno ASC;
+
+<!--#2. 查询没有使用天津供应商生产的红色零件的工程号码（去除重复数据，按工程号码升序排列）。-->
+SELECT DISTINCT jno FROM j 
+	WHERE jno NOT IN(
+		SELECT jno FROM s NATURAL JOIN spj NATURAL JOIN p WHERE s.`city`='天津'AND color='红') ORDER BY jno ASC;
+
+<!--#子查询-->
+SELECT DISTINCT jno FROM j
+	WHERE jno NOT IN(
+		SELECT jno FROM spj
+			WHERE sno IN (SELECT sno FROM s WHERE city='天津') AND pno IN(SELECT pno FROM p WHERE color='红'));
+			
+<!--#not exists-->
+SELECT DISTINCT jno FROM j
+WHERE  NOT EXISTS(
+SELECT jno FROM spj NATURAL JOIN p NATURAL JOIN s WHERE city='天津'AND color='红'AND j.`jno`=jno) ORDER BY jno ASC;
+
+<!--#1. 把全部红色零件的颜色改成蓝色。-->
+UPDATE p
+SET color='蓝'
+WHERE color='红';
+
+<!--#2. 由S5供给J4的零件P6改为由S3供应。-->
+UPDATE spj
+SET sno='S3'
+WHERE sno='S5'AND jno='J4'AND pno='P6';
+
+<!--#3. 从供应商关系中删除供应商号是S2的记录，并从供应情况关系中删除相应的记录。-->
+DELETE FROM s
+WHERE sno='S2';
+DELETE FROM spj
+WHERE sno='s2';
+
+<!--#4. 请将(S2，J6，P4，200)插入供应情况关系表。-->
+INSERT INTO spj(sno,jno,pno,qty)VALUES('S2','J6','P4',200);
+
+<!--#1. 请为“三建”工程项目建立一个供应情况的视图(v_spj)，包括供应商代码(SNO)、零件代码(PNO)、供应数量(QTY)。-->
+CREATE VIEW v_spj AS
+SELECT sno,pno,qty FROM spj
+WHERE jno IN(
+	SELECT jno FROM j
+		WHERE jname='三建'
+);
+
+<!--#(1) 查询“三建”工程项目使用的各种零件代码及其总数量(total)-->
+SELECT pno,SUM(qty) AS total FROM v_spj GROUP BY pno;
+
+<!--#(2) 查询供应商S1的供应情况。-->
+SELECT* FROM v_spj
+	WHERE sno='S1';
+	
+<!--# 1.在spj表定义索引IDX_SPJ，包括（sno,pno,jno）。-->
+CREATE INDEX IDX_SPJ ON spj(sno,pno,jno);
+
+<!--# 2. 查看spj表索引定义。-->
+SHOW INDEX FROM spj;
+SELECT* FROM s;
+SELECT* FROM p;
+SELECT* FROM j;
+SELECT* FROM spj;
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