如何进行SQL查询以将两列的值显示为一列？

Question

我有一个如下所示的表结构。 我想在名称的父项下显示名称（父项是分类帐组）

Answer 1

DECLARE @t1 TABLE
(
 ParentGroup varchar(20),
 LedgerName varchar(20),
 TotalDebit float,
 credit float
)

INSERT INTO @t1
SELECT *
  FROM Table1

INSERT INTO @t1
SELECT Distinct ParentGroup, ParentGroup, NULL, NULL
  FROM Table1

Select LedgerName, TotalDebit, credit from @t1
group by LedgerName, TotalDebit, credit
ORDER BY (CASE WHEN TotalDebit IS NULL THEN 0 ELSE TotalDebit END)