SQLServer语法转Oracle

原表格式与格式是这样的一个格式
A1 A2 A3
指标1 11 1
指标2 12 1
指标3 13 1
指标1 14 2
指标2 15 2
指标3 16 2
指标1 17 3

最终想要的一个结果为
指标1 指标2 指标3
11 12 13  
14 15 16  
17 0 0  

现在在SQLServer中已经写好了这个语句
SQL code

DECLARE @sql VARCHAR(8000)
SET @sql = 'select A3'
SELECT  @sql = @sql + '  ,max(case A1 when ''' + A1
        + ''' then A2 else 0 end) [' + A1 + ']'
FROM    ( SELECT DISTINCT
                    A1
          FROM      Table_1
        ) AS a
SET @sql = @sql + ' from Table_1 group by A3'
EXEC(@sql) 

现在要把他转换成Oracle。但是由于对Oracle不太熟悉。所以请大家帮帮忙

SQL code

WITH t AS
(
SELECT '指标1' a, 11 b, 1 c FROM dual
UNION ALL
SELECT '指标2', 12, 1 FROM dual
UNION ALL
SELECT '指标3', 13, 1 FROM dual
UNION ALL
SELECT '指标1', 14, 2 FROM dual
UNION ALL
SELECT '指标2', 15, 2 FROM dual
UNION ALL
SELECT '指标3', 16, 2 FROM dual
UNION ALL
SELECT '指标1', 17, 3 FROM dual
)

SELECT MAX(CASE WHEN a='指标1' THEN b ELSE 0 END) 指标1,
MAX(CASE WHEN a='指标2' THEN b ELSE 0 END) 指标2,
MAX(CASE WHEN a='指标3' THEN b ELSE 0 END) 指标3
 FROM t GROUP BY c 

--result:
11    12    13
14    15    16
17    0    0

SQL code

--另一种写法!

WITH t AS
(
SELECT '指标1' a, 11 b, 1 c FROM dual
UNION ALL
SELECT '指标2', 12, 1 FROM dual
UNION ALL
SELECT '指标3', 13, 1 FROM dual
UNION ALL
SELECT '指标1', 14, 2 FROM dual
UNION ALL
SELECT '指标2', 15, 2 FROM dual
UNION ALL
SELECT '指标3', 16, 2 FROM dual
UNION ALL
SELECT '指标1', 17, 3 FROM dual
)
SELECT nvl(substr(a_str,1,instr(a_str,',',1,1)-1),0) 指标1,
       CASE WHEN instr(a_str,',',1,2)>0 THEN substr(a_str,instr(a_str,',',1,1)+1,instr(a_str,',',1,2)-instr(a_str,',',1,1)-1) ELSE '0' END 指标2,
       CASE WHEN instr(a_str,',',1,2)>0 THEN substr(a_str,instr(a_str,',',1,2)+1,length(a_str)-instr(a_str,',',1,2)-1) ELSE '0' END 指标3
FROM
(
    SELECT MAX(substr(sys_connect_by_path(b,','),2))||',' a_str
        FROM
        (
               SELECT t.*,row_number()over(PARTITION BY c ORDER BY a) rn FROM t
        )
    START WITH rn=1 
    CONNECT BY rn-1=PRIOR rn AND c=PRIOR c
    GROUP BY  c
)

--result:
11    12    13
14    15    16
17    0    0

select 
  max(case A1 when '指标1' then A2 else 0 end) 指标1,
  max(case A1 when '指标1' then A2 else 0 end) 指标2,
  max(case A1 when '指标1' then A2 else 0 end) 指标3
from tb
group by A3

SQL code

select 
  max(case A1 when '指标1' then A2 else 0 end) 指标1,
  max(case A1 when '指标1' then A2 else 0 end) 指标2,
  max(case A1 when '指标1' then A2 else 0 end) 指标3
from tb
group by A3

select 
  max(decode(A1 , '指标1' , a2 , 0))  指标1,
  max(decode(A1 , '指标2' , a2 , 0))  指标2,
  max(decode(A1 , '指标3' , a2 , 0))  指标3
from tb
group by a3

指标1之类的是未知的名称，不能写死。请看我写的SQL Server的SQL，是用的动态生成的。

A1 中的值是不确定的话 就得用动态的了。

那就类似这样写好了。
SQL code

declare 
var_sql_str varchar2(2000);
type test_array is table of Table_1.A1%type INDEX BY BINARY_INTEGER;
 var_test_array test_array;
 begin 
 select distinct A1  bulk collect into var_test_array from Table_1;
 var_sql_str:='select A3'
 for i in 1..var_test_array.count loop
 begin
 var_sql_str:=var_sql_str||', max(case A1 when '''||var_test_array(i)||''' then A2 else 0 end) as '||var_test_array(i)||''
 end loop;
 var_sql_str:=var_sql_str||' from Table_1 group by A3'
 execute immediate var_sql_str;
 end ;

SQL code

declare 
var_sql_str varchar2(2000);
type test_array is table of Table_1.A1%type INDEX BY BINARY_INTEGER;
 var_test_array test_array;
 begin 
 select distinct A1  bulk collect into var_test_array from Table_1;
 var_sql_str:='select A3'
 for i in 1..var_test_array.count loop
 begin
 var_sql_str:=var_sql_str||', max(case A1 when '''||var_test_array(i)||''' then A2 else 0 end) as '||var_test_array(i)||'';
 end loop;
 var_sql_str:=var_sql_str||' from Table_1 group by A3';
 execute immediate var_sql_str;
 end ;