父/子层次结构 - SQL Server（树）

Question

我试图通过sql查询获取父/子的结构。

我有这段代码：

state_code，description

A000
A010
B000
B010
B01A
B01B
B020
B02A

我想要一个像parent_id，element_id和desc

这样的结构

这样：

A
A000
-01 (from A)
--A010
B
B000
-01
--B010
--B01A
-02
--

我尝试使用此代码，但遗憾的是它不起作用。

select distinct 
    SUBSTRING(REPLACE(state_cd,'0',''),1, LEN(REPLACE(state_cd, '0', '')) -1) AS parent_id, REPLACE(state_cd,'0','') state_id,
    state_cd,
    desc_1
from 
    CATEGORYSTRUCTURE 
inner join 
    CATEGORYITEMS on CATEGORYSTRUCTURE.struct_id = CATEGORYITEMS.struct_id 
left join
    STATECODES on key_1 = state_cd
where
    state_type = '22'

UNION ALL

select distinct  
    SUBSTRING(REPLACE(state_cd,'0',''),1, LEN(REPLACE(state_cd, '0', '')) -1) AS parent_id,
    REPLACE(state_cd,'0','') state_id,
    stat_cd,
    desc_1
from 
    CATEGORYITEMS 
inner join
    STATECODES on key_1 = state_cd
where 
    state_type = '22'

我的结果：

parent_id   stat_id stat_cd desc_1
    O   O000    11
    P   P000    Pa)
    Q   Q000    prod
    R   R000    Zus
    S   S000    Ver
    T   T000    Pack
A   A1  A010    Get
A   A1  A100    Kakt
A   A3  A030    Kol
A   A7  A070    Milk
A   A8  A080    Spt
A1  A11 A110    Lo
A1  A1A A01A    Hcht

我想要的是各个角色下的一切

    A   A7  A070    Milk
    A   A8  A080    Spt
    A   A11 A110    Lo
    A1  A1A A01A    Hcht

Answer 1

我无法理解你想要什么，但我认为这个查询可以帮到你：

/ADSTART  ACTION\(ADD\)/ { # for records where ADSTART occurs
  print buf                # output the buffer variable
  buf=""                   # then empty the buffer
} 
{                          # for all records
  # gsub(/^ +| +$/,"")     # here you could trim leading and trailing space
  buf=buf""$0" "           # build the buffer 
} 
END {                      # in the end
  print buf                # output the remaining buffer
}