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CREATE TABLE [dbo].[categories](
[category_id] [int] IDENTITY(1,1) NOT NULL,
[parent_id] [int] NULL,
[category_name] [varchar](500) NULL,
CONSTRAINT [PK_categories] PRIMARY KEY CLUSTERED
(
[category_id] ASC
) ON [PRIMARY]
) ON [PRIMARY]
GO
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INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (1, 0, CONVERT(TEXT, N'A'))
INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (2, 0, CONVERT(TEXT, N'B'))
INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (3, 1, CONVERT(TEXT, N'AA'))
INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (4, 3, CONVERT(TEXT, N'AAA'))
INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (5, 2, CONVERT(TEXT, N'BB'))
INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (6, 1, CONVERT(TEXT, N'AA2'))
INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (7, 1, CONVERT(TEXT, N'AA3'))
INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (8, 3, CONVERT(TEXT, N'AAA2'))
INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (9, 4, CONVERT(TEXT, N'AAA3'))
INSERT [dbo].[categories] ([category_id], [parent_id], [category_name]) VALUES (10, 2, CONVERT(TEXT, N'BB2'))
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CREATE PROCEDURE [dbo].[Get_TreeData]
AS
BEGIN
--´´½¨ÁÙʱ±í
create table #tmp_table (id int,[level] int)

declare @LevelValue int
set @LevelValue=0
insert #tmp_table select 0,@LevelValue
--½«Êý¾ÝдÈëµ½ÁÙʱ±í
while @@rowcount>0
begin
set @LevelValue=@LevelValue+1


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