如何進行SQL查詢以將兩列的值顯示為一列？

Question

我有一個如下所示的表結構。 我想在名稱的父項下顯示名稱（父項是分類帳組）

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)