Question

我有大桌子，有大约200个字段。从中创建维度表时，大约100个字段将映射到一个字段。问题是我必须像100个插入语句一样逐个添加这100个字段的值。有没有像循环或其他东西，我可以更有效地实现这一目标？

以下是代码示例：

    insert into DimTableA(visit_no, patient, facility, icd9, icd9_flag, ip_op)
    select D.registration, D3.med_number, D3.Hosp_Id, D.final_diagnosis_18,'d',IF(D3.Admit_Type in(1,2,3),'Inpatient','Outpatient'),
    from svch_dischs3_s D3, svch_diags_s D

    insert into DimTableA(visit_no, patient, facility, icd9, icd9_flag, ip_op)
    select D.registration, D3.med_number, D3.Hosp_Id, D.final_diagnosis_19,'d',IF(D3.Admit_Type in(1,2,3),'Inpatient','Outpatient'),
    from svch_dischs3_s D3, svch_diags_s D

    insert into DimTableA(visit_no, patient, facility, icd9, icd9_flag, ip_op)
    select D.registration, D3.med_number, D3.Hosp_Id, D.final_diagnosis_20,'d',IF(D3.Admit_Type in(1,2,3),'Inpatient','Outpatient'),
    from svch_dischs3_s D3, svch_diags_s D;

.........等等

唯一更改的字段名称是'icd9'输入（即D.final_diagnosis_18，final_diagnosis_19，final_diagnosis_20 ....）

任何帮助都会非常感激，小伙子们。 :)

Answer 1

您可以使用交叉连接将这些列展开到一组固定的数字，如下所示：

insert into DimTableA (
  visit_no,
  patient,
  facility,
  icd9,
  icd9_flag,
  ip_op
)
select
  D.registration,
  D3.med_number,
  D3.Hosp_Id,
  case N.number
    when 1 then D.final_diagnosis_18
    when 2 then D.final_diagnosis_19
    when 3 then D.final_diagnosis_20
    ...
  end,
  'd',
  IF(D3.Admit_Type in(1,2,3),'Inpatient','Outpatient')
from
  svch_dischs3_s D3,
  svch_diags_s D,
  (
    select 1 as number union all
    select 2           union all
    select 3           union all
    ...  /* up to the number of columns to unpivot */
  ) N

您可以create and populate a persistent numbers table而不是内联视图，并在查询中使用该表的必要子集。在这种情况下，查询会像这样改变

...
from
  svch_dischs3_s D3,
  svch_diags_s D,
  numbers N
where N.number between 1 and … /* the number of columns to unpivot */

Answer 2

您可以尝试在子选择中使用UNION运行单个INSERT。

你当前的SQL中有一个Cartesian join，所以我猜你错过了某个地方的连接。无论如何，这应该让你知道我在驾驶什么：

insert into DimTableA(visit_no, patient, facility, icd9, icd9_flag, ip_op)
select D.registration, D3.med_number, D3.Hosp_Id, D.final_diagnosis_18,'d',IF(D3.Admit_Type in(1,2,3),'Inpatient','Outpatient')
from svch_dischs3_s D3, svch_diags_s D
-- where D3.???? = D.????
union
select D.registration, D3.med_number, D3.Hosp_Id, D.final_diagnosis_19,'d',IF(D3.Admit_Type in(1,2,3),'Inpatient','Outpatient')
from svch_dischs3_s D3, svch_diags_s D
-- where D3.???? = D.????
union
select D.registration, D3.med_number, D3.Hosp_Id, D.final_diagnosis_20,'d',IF(D3.Admit_Type in(1,2,3),'Inpatient','Outpatient')
from svch_dischs3_s D3, svch_diags_s D
-- where D3.???? = D.????;

这是一个更理论化的例子：

create table dimTable
(id int unsigned not null default 0,
field varchar(50)
);

create table sourceTable
(id int unsigned not null default 0,
field1 varchar(50),
field2 varchar(50),
field3 varchar(50),
field4 varchar(50),
field5 varchar(50)
);

insert into sourceTable (id,field1,field2,field3,field4,field5) values (1,"hello","these","are","some","values");
insert into sourceTable (id,field1,field2,field3,field4,field5) values (2,"hello2","these2","are2","some2","values2");
insert into sourceTable (id,field1,field2,field3,field4,field5) values (3,"hello3","these3","are3","some3","values3");
insert into sourceTable (id,field1,field2,field3,field4,field5) values (4,"hello4","these4","are4","some4","values4");
insert into sourceTable (id,field1,field2,field3,field4,field5) values (5,"hello5","these5","are5","some5","values5");

insert into dimTable (id, field)
select id,field1 from sourceTable
union
select id,field2 from sourceTable
union
select id,field3 from sourceTable
union
select id,field4 from sourceTable
union
select id,field5 from sourceTable;

select *
from dimTable;

希望它有所帮助！

Answer 3

存储过程可以解决您的问题。您可能只需要将要插入的字段值和后缀传递给D.final_diagnosis_字段。

示例代码段如下所示：

drop procedure if exists proc_insert_icd9;
delimiter //
create procedure proc_insert_icd9( final_diagnosis_suffix int )
    begin
        declare suffixId int;
        declare sql_insert_str varchar( 255 );
        declare sql_select_str varchar( 255 );
        declare sql_temp varchar( 255 );
        set suffixId = final_diagnosis_suffix;

        set sql_insert_str = 'insert into DimTableA(visit_no, patient, facility, icd9, icd9_flag, ip_op) ';
        set sql_select_str = concat( 'select D.registration, D3.med_number, D3.Hosp_Id, D.final_diagnosis_', suffixId, ', ''d'', IF(D3.Admit_Type in(1,2,3), ''Inpatient'', ''Outpatient'' ) from svch_dischs3_s D3, svch_diags_s D' );

        select concat( sql_insert_str, sql_select_str ) into @sql_temp;

        prepare stmt from @sql_temp;
        execute stmt;
    end;
//
delimiter ;

现在尝试使用final_diagnosis字段的正确后缀值作为参数调用您需要多次的过程。
示例：

call proc_insert_icd9( 18 );
call proc_insert_icd9( 19 );

注意：您可以修改程序以包含

更多输入参数来处理where子句等。
select语句的where子句。

在SQL中的多个字段中的值中插入值

3 个答案: