Question

我需要拆分下面给出的列数据，包括查询和值

create table dep (
    a1 varchar(17),
    a2 char(2),
    a3 varchar(50),
    a4 int,
    a5 int,
    a6 int, 
    a7 char(1)
)

insert into dep (a1,a2,a3,a4,a5,a6,a7) values(507,01,'abc1',30,1,2,1)
insert into dep (a1,a2,a3,a4,a5,a6,a7) values(507,02,'abc2',31,2,1,0)
insert into dep (a1,a2,a3,a4,a5,a6,a7) values(507,03,'abc3',32,1,6,1)
insert into dep (a1,a2,a3,a4,a5,a6,a7) values(507,04,'abc4',33,1,3,0)
insert into dep (a1,a2,a3,a4,a5,a6,a7) values(507,05,'abc5',34,2,4,1)

需要拆分列a2及其对应列a3，a4，a5。输出如下：

a1  b1  b2  b3  b4  b5  c1    c2 c3  c4 c5  d1   d2 d3  d4  d5
507 abc 01  30  1   2   abc3  03 32  1  6   abc5 05 34  2   4

如果a7为0则应跳过该记录。

Answer 1

IMHO;如果我正确理解你的要求;我认为 - 作为静态查询 - 你可以使用这样的查询：

SELECT a1
    , MAX(CASE WHEN rn = 1 THEN a2 END) b1
    , MAX(CASE WHEN rn = 1 THEN a3 END) b2
    , MAX(CASE WHEN rn = 1 THEN a4 END) b3
    , MAX(CASE WHEN rn = 1 THEN a5 END) b4
    , MAX(CASE WHEN rn = 1 THEN a6 END) b5
    , MAX(CASE WHEN rn = 2 THEN a2 END) c1
    , MAX(CASE WHEN rn = 2 THEN a3 END) c2
    , MAX(CASE WHEN rn = 2 THEN a4 END) c3
    , MAX(CASE WHEN rn = 2 THEN a5 END) c4
    , MAX(CASE WHEN rn = 2 THEN a6 END) c5
    , MAX(CASE WHEN rn = 3 THEN a2 END) d1
    , MAX(CASE WHEN rn = 3 THEN a3 END) d2
    , MAX(CASE WHEN rn = 3 THEN a4 END) d3
    , MAX(CASE WHEN rn = 3 THEN a5 END) d4
    , MAX(CASE WHEN rn = 3 THEN a6 END) d5
FROM (
    SELECT *, ROW_NUMBER() OVER (ORDER BY a2) as rn
    FROM dep
    WHERE a7 = 1) t
GROUP BY a1;

动态SQL的解决方案可以是这样的：

DECLARE @sql varchar(max) = 'SELECT a1';
SELECT
    @sql = @sql + ',MAX(CASE WHEN rn = ' + CAST(rn as varchar(5)) + ' THEN a2 END) ' + CHAR(64 + rn) + '1' 
                + ',MAX(CASE WHEN rn = ' + CAST(rn as varchar(5)) + ' THEN a3 END) ' + CHAR(64 + rn) + '1'
                + ',MAX(CASE WHEN rn = ' + CAST(rn as varchar(5)) + ' THEN a4 END) ' + CHAR(64 + rn) + '1'
                + ',MAX(CASE WHEN rn = ' + CAST(rn as varchar(5)) + ' THEN a5 END) ' + CHAR(64 + rn) + '1'
FROM (
    SELECT *
        , ROW_NUMBER() OVER (ORDER BY a2) as rn
    FROM #dep
    WHERE a7 = 1) t;

SET @sql = @sql + 'FROM (SELECT *, ROW_NUMBER() OVER (ORDER BY a2) as rn FROM dep WHERE a7 = 1) t GROUP BY a1';
EXEC(@sql);

编辑：在您的情况下，我认为您可以使用以下查询：

DECLARE @sql nvarchar(max) = 'SELECT FamilyId', @maxDepe int;

SELECT @maxDepe = max(seq) 
FROM (
    SELECT *
        , ROW_NUMBER() OVER (PARTITION BY FamilyId ORDER BY MemberID) As seq
    FROM depe) dt;

WITH CTE(i) AS (
    SELECT 1
    UNION ALL
    SELECT i + 1
    FROM CTE 
    WHERE i < @maxDepe)
SELECT @sql = @sql +
    ',MAX(CASE WHEN seq = ' + CAST(i as varchar(3)) + ' THEN MemberName END) Dependent_' + CAST(i as varchar(3)) +
    ',MAX(CASE WHEN seq = ' + CAST(i as varchar(3)) + ' THEN Age END) Age_' + CAST(i as varchar(3)) + 
    ',MAX(CASE WHEN seq = ' + CAST(i as varchar(3)) + ' THEN Gender END) Gender_' + CAST(i as varchar(3)) +
    ',MAX(CASE WHEN seq = ' + CAST(i as varchar(3)) + ' THEN RelationCode END) RelationCode_' + CAST(i as varchar(3))
FROM CTE;

SELECT @sql = @sql + ' FROM (SELECT *, ROW_NUMBER() OVER (PARTITION BY FamilyId ORDER BY MemberID) seq FROM depe) dt GROUP BY FamilyId';

EXEC(@sql);

根据多个条件和列将列数据拆分为单独的列

1 个答案: