[SQL statement] Normal row-column conversion (Full Version)

Title: normal row/column conversion (Version 2.0) Note: normal row/column conversion (version 1.0) only provides static and dynamic writing for SQL Server 2000, and Version 2.0 adds SQL Server 2005 related writing.   Question: Suppose there is a student orders table (TB) as follows: Name course score Zhang San Language 74 James math 83 Zhang San physical 93 Li Si language 74 Li Si mathematics 84 Li Si physical 94 (The following result is displayed ): Name, Chinese, Mathematics, Physics ---------------- Li Si 74 84 94 Zhang San 74 83 93 ------------------- */   Create Table Tb (name varchar (10), course varchar (10), score Int ) Insert into TB values ( 'Zhang san' , 'China' , 74) Insert into TB values ( 'Zhang san' , 'Mat' , 83) Insert into TB values ( 'Zhang san' , 'Physical' , 93) Insert into TB values ( 'Li si' , 'China' , 74) Insert into TB values ( 'Li si' , 'Mat' , 84) Insert into TB values ( 'Li si' , 'Physical' , 94) Go   -- SQL Server 2000 static SQL indicates that the course only includes three courses: Chinese, mathematics, and physics. (Same as below) Select name As Name, Max ( Case Course when 'China' Then score Else 0 end) language, Max ( Case Course when 'Mat' Then score Else 0 end) mathematics, Max ( Case Course when 'Physical' Then score Else 0 end) Physical From TB Group by name   -- SQL Server 2000 dynamic SQL refers to three courses, including Chinese, mathematics, and physics. (Same as below) Declare @ SQL varchar (8000) Set @ SQL = 'Select name' Select @ SQL = @ SQL + ', Max (Case course when' '' + Course + '' 'Then score else 0 end )[' + Course + ']' From (select distinct course from TB) As A Set @ SQL = @ SQL + 'From TB group byname' Exec (@ SQL)   -- SQL Server 2005 static SQL. Select * from (select * from TB) a round (max (score) For Course In (Chinese, Mathematics, Physics) B   -- SQL Server 2005 dynamic SQL. Declare @ SQL varchar (8000) Select @ SQL = isnull (@ SQL + '], [' , '' ) + Course from TB group by course Set @ SQL = '[' + @ SQL + ']' Exec ( 'Select * from (select * from TB) a round (max (score) for course in (' + @ SQL + ') B' )   ---------------------------------   /* Problem: Based on the above results, the average score and total score are added. The following result is obtained: Name, Chinese, mathematics, and physics average score -------------------------- Li Si 74 84 94 84.00 252 Zhang San 74 83 93 83.33 250 */   -- SQL Server 2000 static SQL. Select name, Max ( Case Course when 'China' Then score Else 0 end) language, Max ( Case Course when 'Mat' Then score Else 0 end) mathematics, Max ( Case Course when 'Physical' Then score Else 0 end) physical, Cast (AVG (score * 1.0) As Decimal () Average score, Sum (score) total score From TB Group by name   -- SQL Server 2000 dynamic SQL. Declare @ SQL varchar (8000) Set @ SQL = 'Select name' Select @ SQL = @ SQL + ', Max (Case course when' '' + Course + '' 'Then score else 0 end )[' + Course + ']' From (select distinct course from TB) As A Set @ SQL = @ SQL + ', Cast (AVG (score * 1.0) as decimal () average score, sum (score) total score from TB group by name' Exec (@ SQL)   -- SQL Server 2005 static SQL. Select M. *, N. Average score, N. Total score from (Select * from TB) a round (max (score) For Course In (Chinese, Mathematics, Physics) B) m, (Select name, cast (AVG (score * 1.0) As Decimal () Average score, sum (score) total score from TB group by name) N Where M. Name = n. Name   -- SQL Server 2005 dynamic SQL. Declare @ SQL varchar (8000) Select @ SQL = isnull (@ SQL + ',' , '' ) + Course from TB group by course Exec ('select M. *, N. Average score, N. Total score from (Select * from TB) a round (max (score) For Course In ( '+ @ SQL +' ) B) m, (Select name, cast (AVG (score * 1.0) As Decimal () Average score, sum (score) total score from TB group by name) N Where M. Name = n. name ')   Drop table TB   ------------------ ------------------   /* Question: If the two tables change each other: the table structure and data are: Name, Chinese, Mathematics, Physics Zhang San 74 83 93 Li Si 74 84 94 (The following result is displayed ): Name course score ------------ Li Si language 74 Li Si mathematics 84 Li Si physical 94 Zhang San Language 74 James math 83 Zhang San physical 93 -------------- */   Create Table Tb (name varchar (10), Chinese Int , Mathematics Int , Physical Int ) Insert into TB values ( 'Zhang san' , 93) Insert into TB values ( 'Li si' , 94) Go   -- SQL Server 2000 static SQL. Select * from (   Select name, course = 'China' , Score = Chinese from TB Union all   Select name, course = 'Mat' , Score = mathematics from TB   Union all   Select name, course = 'Physical' , Score = physical from TB ) T Order by name, Case Course when 'China' Then 1 when 'Mat' Then 2 when 'Physical' Then 3 end   -- SQL Server 2000 dynamic SQL. -- Call the dynamic ecosystem of the system table. Declare @ SQL varchar (8000) Select @ SQL = isnull (@ SQL + 'Union all' , '' ) + 'Select name, [course] =' + Quotename (name, '' '' ) + ', [Score] =' + Quotename (name) + 'From tb' From syscolumns Where name! = N 'Name' And Id = object_id ( 'Tb' ) -- Table name TB, excluding other columns whose names are Order by colid ASC Exec (@ SQL + 'Order by name' )   -- SQL Server 2005 dynamic SQL. Select name, course, score from TB unordered (score For Course In ([Chinese], [mathematics], [physics]) T   -- SQL Server 2005 dynamic SQL, same as SQL Server 2000 dynamic SQL.   -------------------- /* Problem: add an average score and the total score to the above result. The following result is obtained: Name course score ---------------- Li Si language 74.00 Li Si, mathematics 84.00 Li Si physical 94.00 Li Si average score 84.00 Li Si's total score is 252.00 Zhang San Chinese 74.00 Zhang San, mathematics 83.00 Zhang San physical 93.00 Michael Jacob has an average score of 83.33. Zhang San's total score is 250.00 ------------------ */   Select * from (   Select name As Name, course = 'China' , Score = Chinese from TB Union all   Select name As Name, course = 'Mat' , Score = mathematics from TB   Union all   Select name As Name, course = 'Physical' , Score = physical from TB   Union all   Select name As Name, course = 'Average' , Score = cast (Chinese + mathematics + physics) * 1.0/3 As Decimal (18, 2) from TB   Union all   Select name As Name, course = 'Total' , Score = Chinese + mathematics + Physical from TB ) T Order by name, Case Course when 'China' Then 1 when 'Mat' Then 2 when 'Physical' Then 3 when 'Average' Then 4 when 'Total' Then 5 end Turn: http://www.cnblogs.com/temptation/archive/2012/04/02/2429904.html