使用 Python sqlparse 获取查询树/层次结构
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【中文标题】使用 Python sqlparse 获取查询树/层次结构【英文标题】：get query tree/hierarchy using Python sqlparse 【发布时间】：2021-12-13 05:03:33 【问题描述】：我正在开发一个客户数据库，其中包含从复杂查询创建的大量视图，其中包含大量的查询和连接，如下面的示例查询。
我已经在使用sqlparse 来获取表名，但现在我想知道是否可以使用查询树/层次结构获取嵌套字典，从而允许创建如下所示的树视图：
结果会是这样的：
+-FULL JOIN-+
|
+-- QUERY 01 +
| |
| +-- QUERY 01.01 +
| |
| + -- QUERY 01.01.01
| + -- QUERY 01.01.02
+-- QUERY 02 +
etc...
对于每个 QUERY，在 FROM 子句中列出来源
示例查询：
SELECT --Locais Disponíveis para Abertura de Ordens de corte
COALESCE(a."Chave", b."Chave") AS "Chave",
COALESCE(a."Unidade", b."Unidade") AS "Unidade",
COALESCE(a."Fazenda", b."Fazenda") AS "Fazenda",
COALESCE(a."Talhao", b."Talhao") AS "Talhao",
COALESCE(a."Participacao", b."Participacao") AS "Participacao",
CASE
WHEN a."Condicao" = 'Disponível Parcial (Moagem)' AND
b."Condicao" = 'Disponível Parcial (Mudas)' THEN
'Disponível (Safra+Mudas)'
ELSE
COALESCE(a."Condicao", b."Condicao")
END AS "Condicao",
COALESCE(a."Estagio", b."Estagio") AS "Estagio",
COALESCE(a."Variedade", b."Variedade") AS "Variedade",
COALESCE(a."Ciclo Maturacao", b."Ciclo Maturacao") AS "Ciclo Maturacao",
COALESCE(a."Propriedade", b."Propriedade") AS "Propriedade",
COALESCE(a."Proprietario", b."Proprietario") AS "Proprietario",
COALESCE(a."No. Corte", b."No. Corte") AS "No. Corte",
(CASE
WHEN a."Area" IS NULL THEN
0
ELSE
a."Area"
END + CASE
WHEN b."Area" IS NULL THEN
0
ELSE
b."Area"
END) AS "Area",
CASE
WHEN a."Condicao" = 'Disponível Parcial (Moagem)' AND
b."Condicao" = 'Disponível Parcial (Mudas)' THEN
((CASE
WHEN a."Area" IS NULL THEN
0
ELSE
a."Area"
END + CASE
WHEN b."Area" IS NULL THEN
0
ELSE
b."Area"
END) * a."TCH")
ELSE
a."Toneladas"
END AS "Toneladas",
a."TCH",
COALESCE(a."Distancia", b."Distancia") AS "Distancia"
FROM (SELECT --Disponibilidade (Moagem)
A.*,
a."Area" * b."TCH" AS "Toneladas",
b."TCH" AS "TCH",
c."Dist. Terra" + c."Dist. Asfalto" AS "Distancia"
FROM ((SELECT --ÁREAS DISPONÍVEIS PARA ABERTURA DE ORDEM CORTE DE SAFRA
a."Fazenda" * 1000 + a."Talhao" AS "Chave",
CASE
WHEN a."Unidade" = 15 THEN
'USF'
ELSE
'URD'
END AS "Unidade",
a."Fazenda",
a."Talhao",
a."Participacao",
CASE
WHEN a."Ocorrencia Cadastro" = 'C' THEN
'Disponível Total (Moagem)'
ELSE
'Disponível Parcial (Moagem)'
END AS "Condicao",
a."Estagio",
a."Variedade",
a."Ciclo Maturacao",
a."Propriedade",
a."Proprietario",
a."No. Corte",
(a."Area" - (CASE
WHEN b."Area Fechada" IS NULL THEN
0
ELSE
b."Area Fechada"
END)) AS "Area"
FROM (SELECT --ULTIMA ESTIMATIVA DO TALHAO A
OBJ.CD_UNID_IND AS "Unidade",
OBJ.CD_UPNIVEL1 AS "Fazenda",
OBJ.CD_UPNIVEL3 AS "Talhao",
OBJ.CD_UPNIVEL1 || ' - ' || F.DE_UPNIVEL1 AS "Propriedade",
G.DE_FORNEC AS "Proprietario",
CASE
WHEN UP3.CD_TP_PROPR IN (1, 2, 3, 11) THEN
'Parceria'
WHEN UP3.CD_TP_PROPR IN (5, 8) THEN
'Fornecedor'
WHEN UP3.CD_TP_PROPR = 6 THEN
'Fornecedor'
WHEN UP3.CD_TP_PROPR = 14 THEN
'Parceria'
ELSE
'Verificar'
END AS "Participacao",
C.FG_OCORREN AS "Ocorrencia Cadastro",
C.DT_OCORREN AS "Data Ocorrencia",
B.DA_ESTAGIO AS "Estagio",
B.NO_CORTE AS "No. Corte",
D.DE_VARIED AS "Variedade",
E.DE_MATURAC AS "Ciclo Maturacao",
(OBJ.QT_AREA_PROD * 1) AS "Area",
(OBJ.QT_CANA_ENTR / 1000) AS "Toneladas"
FROM PIMSCS.HISTPREPRO OBJ,
PIMSCS.ESTAGios B,
PIMSCS.UPNIVEL3 UP3,
PIMSCS.SAFRUPNIV3 C,
PIMSCS.VARIEDADES D,
PIMSCS.TIPO_MATURAC E,
PIMSCS.UPNIVEL1 F,
PIMSCS.FORNECS G
WHERE OBJ.CD_SAFRA =
(SELECT MAX(CD_SAFRA) FROM PIMSCS.HISTPREPRO)
AND OBJ.CD_UNID_IND IN (15, 19)
AND OBJ.CD_ESTAGIO = B.CD_ESTAGIO
AND OBJ.CD_UPNIVEL1 = UP3.CD_UPNIVEL1
AND OBJ.CD_UPNIVEL3 = UP3.CD_UPNIVEL3
AND OBJ.CD_SAFRA = UP3.CD_SAFRA
AND OBJ.CD_UPNIVEL1 = C.CD_UPNIVEL1
AND OBJ.CD_UPNIVEL3 = C.CD_UPNIVEL3
AND OBJ.CD_SAFRA = C.CD_SAFRA
AND UP3.CD_VARIED = D.CD_VARIED
AND E.FG_MATURAC = D.FG_MATURAC
AND OBJ.CD_UPNIVEL1 = F.CD_UPNIVEL1
AND F.CD_FORNEC = G.CD_FORNEC
AND C.DT_OCORREN =
(SELECT MAX(D.DT_OCORREN)
FROM PIMSCS.SAFRUPNIV3 D
WHERE D.CD_UPNIVEL1 = C.CD_UPNIVEL1
AND D.CD_UPNIVEL3 = C.CD_UPNIVEL3
AND D.CD_SAFRA = C.CD_SAFRA)
AND OBJ.CD_HIST =
(SELECT OBJ2.CD_HIST
FROM PIMSCS.HISTPREPRO OBJ2
WHERE OBJ2.CD_UPNIVEL1 = OBJ.CD_UPNIVEL1
AND OBJ2.CD_UPNIVEL3 = OBJ.CD_UPNIVEL3
AND OBJ2.CD_SAFRA =
(SELECT MAX(CD_SAFRA)
FROM PIMSCS.HISTPREPRO)
AND OBJ2.CD_HIST NOT IN ('E', 'S')
AND OBJ2.CD_EMPRESA IN (15, 19)
AND OBJ2.DT_HISTORICO =
(SELECT MAX(OBJ3.DT_HISTORICO)
FROM PIMSCS.HISTPREPRO OBJ3
WHERE OBJ3.CD_UPNIVEL1 =
OBJ.CD_UPNIVEL1
AND OBJ3.CD_UPNIVEL3 =
OBJ.CD_UPNIVEL3
AND OBJ3.CD_SAFRA =
(SELECT MAX(CD_SAFRA)
FROM PIMSCS.HISTPREPRO)
AND OBJ3.CD_HIST NOT IN ('E', 'S')
AND OBJ3.CD_EMPRESA IN (15, 19)))) A,
(SELECT --ÁREA DE ORDEM DE CORTE DE SAFRA FECHADA B
QD.CD_UPNIVEL1 AS "Fazenda",
QD.CD_UPNIVEL3 AS "Talhao",
SUM(QD.QT_AREA) AS "Area Fechada"
FROM PIMSCS.QUEIMA_HE QH, PIMSCS.QUEIMA_DE QD
WHERE QH.NO_QUEIMA = QD.NO_QUEIMA
AND QD.CD_SAFRA =
(SELECT MAX(CD_SAFRA) FROM PIMSCS.HISTPREPRO)
GROUP BY QD.CD_UPNIVEL1, QD.CD_UPNIVEL3) B
WHERE a."Fazenda" = b."Fazenda"(+)
AND a."Talhao" = b."Talhao"(+)
AND a."Ocorrencia Cadastro" <> 'F'
AND (a."Area" - (CASE
WHEN b."Area Fechada" IS NULL THEN
0
ELSE
b."Area Fechada"
END)) > 0)) A
LEFT JOIN (SELECT --Ultima Estimativa do Talhão
A.CD_HIST "Cod. Historico",
CASE
WHEN A.CD_UNID_IND = 15 THEN
'USF'
ELSE
'URD'
END AS "Unidade",
A.CD_UPNIVEL1 AS "Zona",
A.CD_UPNIVEL3 AS "Talhao",
A.DT_HISTORICO AS "Data",
A.QT_AREA_PROD AS "Area",
(A.QT_CANA_ENTR / 1000) AS "Toneladas",
A.QT_TCH AS "TCH"
FROM PIMSCS.HISTPREPRO A
WHERE A.CD_UNID_IND IN (15, 19)
AND A.CD_SAFRA =
(SELECT MAX(CD_SAFRA) FROM PIMSCS.HISTPREPRO)
AND A.CD_HIST NOT IN ('E', 'S')
AND A.QT_AREA_PROD <> 0
AND A.DT_HISTORICO =
(SELECT MAX(A2.DT_HISTORICO)
FROM PIMSCS.HISTPREPRO A2
WHERE A.CD_SAFRA = A2.CD_SAFRA
AND A.CD_UPNIVEL2 = A2.CD_UPNIVEL1
AND A.CD_UPNIVEL3 = A2.CD_UPNIVEL3
AND A2.CD_HIST NOT IN ('E', 'S'))) B
ON a."Fazenda" = b."Zona"
AND a."Talhao" = b."Talhao"
LEFT JOIN (SELECT --Distancia Cadastrada
A.CD_UPNIVEL1 AS "Zona",
A.CD_UPNIVEL3 AS "Talhao",
MAX(A.DS_TERRA) AS "Dist. Terra",
MAX(A.DS_ASFALTO) AS "Dist. Asfalto"
FROM PIMSCS.UPNIVEL3 A
LEFT JOIN PIMSCS.SAFRUPNIV3 B
ON A.CD_SAFRA = B.CD_SAFRA
AND A.CD_UPNIVEL1 = B.CD_UPNIVEL1
AND A.CD_UPNIVEL3 = B.CD_UPNIVEL3
WHERE A.CD_UNID_IND IN (15, 19)
AND A.CD_OCUP = 1
AND A.CD_SAFRA =
(SELECT MAX(CD_SAFRA) FROM PIMSCS.HISTPREPRO)
AND B.CD_SAFRA =
(SELECT MAX(CD_SAFRA) FROM PIMSCS.HISTPREPRO)
AND B.FG_OCORREN <> 'I'
AND B.DT_OCORREN =
(SELECT MAX(B2.DT_OCORREN)
FROM PIMSCS.SAFRUPNIV3 B2
WHERE B.CD_SAFRA = B2.CD_SAFRA
AND B.CD_UPNIVEL1 = B2.CD_UPNIVEL1
AND B.CD_UPNIVEL3 = B2.CD_UPNIVEL3)
GROUP BY A.CD_UPNIVEL1, A.CD_UPNIVEL3) C
ON a."Fazenda" = c."Zona"
AND a."Talhao" = c."Talhao") A
FULL JOIN (SELECT --Disponibilidade (Mudas)
A.*,
a."Area" * b."TCH" AS "Toneladas",
b."TCH" AS "TCH",
c."Dist. Terra" + c."Dist. Asfalto" AS "Distancia"
FROM ((SELECT --ÁREAS DISPONÍVEIS PARA ABERTURA DE ORDEM CORTE DE SAFRA
a."Fazenda" * 1000 + a."Talhao" AS "Chave",
CASE
WHEN a."Unidade" = 15 THEN
'USF'
ELSE
'URD'
END AS "Unidade",
a."Fazenda",
a."Talhao",
a."Participacao",
CASE
WHEN a."Ocorrencia Cadastro" = 'C' THEN
'Disponível Total (Mudas)'
ELSE
'Disponível Parcial (Mudas)'
END AS "Condicao",
a."Estagio",
a."Variedade",
a."Ciclo Maturacao",
a."Propriedade",
a."Proprietario",
a."No. Corte",
(a."Area" - (CASE
WHEN b."Area Fechada" IS NULL THEN
0
ELSE
b."Area Fechada"
END)) AS "Area"
FROM (SELECT --ULTIMA ESTIMATIVA DO TALHAO A
OBJ.CD_UNID_IND AS "Unidade",
OBJ.CD_UPNIVEL1 AS "Fazenda",
OBJ.CD_UPNIVEL3 AS "Talhao",
OBJ.CD_UPNIVEL1 || ' - ' || F.DE_UPNIVEL1 AS "Propriedade",
G.DE_FORNEC AS "Proprietario",
CASE
WHEN UP3.CD_TP_PROPR IN (1, 2, 3, 11) THEN
'Parceria'
WHEN UP3.CD_TP_PROPR IN (5, 8) THEN
'Fornecedor'
WHEN UP3.CD_TP_PROPR = 6 THEN
'Fornecedor'
WHEN UP3.CD_TP_PROPR = 14 THEN
'Parceria'
ELSE
'Verificar'
END AS "Participacao",
C.FG_OCORREN AS "Ocorrencia Cadastro",
C.DT_OCORREN AS "Data Ocorrencia",
B.DA_ESTAGIO AS "Estagio",
B.NO_CORTE AS "No. Corte",
D.DE_VARIED AS "Variedade",
E.DE_MATURAC AS "Ciclo Maturacao",
(OBJ.QT_AREA_PROD * 1) AS "Area",
(OBJ.QT_CANA_ENTR / 1000) AS "Toneladas"
FROM PIMSCS.HISTPREPRO OBJ,
PIMSCS.ESTAGIOS B,
PIMSCS.UPNIVEL3 UP3,
PIMSCS.SAFRUPNIV3 C,
PIMSCS.VARIEDADES D,
PIMSCS.TIPO_MATURAC E,
PIMSCS.UPNIVEL1 F,
PIMSCS.FORNECS G
WHERE OBJ.CD_SAFRA =
(SELECT MAX(CD_SAFRA)
FROM PIMSCS.HISTPREPRO)
AND OBJ.CD_UNID_IND IN (15, 19)
AND OBJ.CD_ESTAGIO = B.CD_ESTAGIO
AND OBJ.CD_UPNIVEL1 = UP3.CD_UPNIVEL1
AND OBJ.CD_UPNIVEL3 = UP3.CD_UPNIVEL3
AND OBJ.CD_SAFRA = UP3.CD_SAFRA
AND OBJ.CD_UPNIVEL1 = C.CD_UPNIVEL1
AND OBJ.CD_UPNIVEL3 = C.CD_UPNIVEL3
AND OBJ.CD_SAFRA = C.CD_SAFRA
AND UP3.CD_VARIED = D.CD_VARIED
AND E.FG_MATURAC = D.FG_MATURAC
AND OBJ.CD_UPNIVEL1 = F.CD_UPNIVEL1
AND F.CD_FORNEC = G.CD_FORNEC
AND C.DT_OCORREN =
(SELECT MAX(D.DT_OCORREN)
FROM PIMSCS.SAFRUPNIV3 D
WHERE D.CD_UPNIVEL1 = C.CD_UPNIVEL1
AND D.CD_UPNIVEL3 = C.CD_UPNIVEL3
AND D.CD_SAFRA = C.CD_SAFRA)
AND OBJ.CD_HIST =
(SELECT OBJ2.CD_HIST
FROM PIMSCS.HISTPREPRO OBJ2
WHERE OBJ2.CD_UPNIVEL1 = OBJ.CD_UPNIVEL1
AND OBJ2.CD_UPNIVEL3 = OBJ.CD_UPNIVEL3
AND OBJ2.CD_SAFRA =
(SELECT MAX(CD_SAFRA)
FROM PIMSCS.HISTPREPRO)
AND OBJ2.CD_HIST = 'S'
AND OBJ2.CD_EMPRESA IN (15, 19)
AND OBJ2.DT_HISTORICO =
(SELECT MAX(OBJ3.DT_HISTORICO)
FROM PIMSCS.HISTPREPRO OBJ3
WHERE OBJ3.CD_UPNIVEL1 =
OBJ.CD_UPNIVEL1
AND OBJ3.CD_UPNIVEL3 =
OBJ.CD_UPNIVEL3
AND OBJ3.CD_SAFRA =
(SELECT MAX(CD_SAFRA)
FROM PIMSCS.HISTPREPRO)
AND OBJ3.CD_HIST = 'S'
AND OBJ3.CD_EMPRESA IN (15, 19)))) A,
(SELECT --ÁREA DE ORDEM DE CORTE DE MUDAS FECHADA B
A.CD_UPNIVEL1 AS "Fazenda",
A.CD_UPNIVEL3 AS "Talhao",
SUM(A.QT_AREA) AS "Area Fechada"
FROM PIMSCS.OCORTEMD_DE A
JOIN PIMSCS.OCORTEMD_HE B
ON A.NO_ORDEM = B.NO_ORDEM
WHERE A.CD_SAFRA =
(SELECT MAX(CD_SAFRA)
FROM PIMSCS.HISTPREPRO)
AND B.FG_SITUACAO = 'F'
GROUP BY A.CD_UPNIVEL1, A.CD_UPNIVEL3) B
WHERE a."Fazenda" = b."Fazenda"(+)
AND a."Talhao" = b."Talhao"(+)
AND a."Ocorrencia Cadastro" <> 'F'
AND (a."Area" - (CASE
WHEN b."Area Fechada" IS NULL THEN
0
ELSE
b."Area Fechada"
END)) > 0)) A
LEFT JOIN (SELECT --Ultima Estimativa do Talhão
A.CD_HIST "Cod. Historico",
CASE
WHEN A.CD_UNID_IND = 15 THEN
'USF'
ELSE
'URD'
END AS "Unidade",
A.CD_UPNIVEL1 AS "Zona",
A.CD_UPNIVEL3 AS "Talhao",
A.DT_HISTORICO AS "Data",
A.QT_AREA_PROD AS "Area",
(A.QT_CANA_ENTR / 1000) AS "Toneladas",
A.QT_TCH AS "TCH"
FROM PIMSCS.HISTPREPRO A
WHERE A.CD_UNID_IND IN (15, 19)
AND A.CD_SAFRA =
(SELECT MAX(CD_SAFRA) FROM PIMSCS.HISTPREPRO)
AND A.CD_HIST = 'S'
AND A.QT_AREA_PROD <> 0
AND A.DT_HISTORICO =
(SELECT MAX(A2.DT_HISTORICO)
FROM PIMSCS.HISTPREPRO A2
WHERE A.CD_SAFRA = A2.CD_SAFRA
AND A.CD_UPNIVEL2 = A2.CD_UPNIVEL1
AND A.CD_UPNIVEL3 = A2.CD_UPNIVEL3
AND A2.CD_HIST = 'S')) B
ON a."Fazenda" = b."Zona"
AND a."Talhao" = b."Talhao"
LEFT JOIN (SELECT --Distancia Cadastrada
A.CD_UPNIVEL1 AS "Zona",
A.CD_UPNIVEL3 AS "Talhao",
MAX(A.DS_TERRA) AS "Dist. Terra",
MAX(A.DS_ASFALTO) AS "Dist. Asfalto"
FROM PIMSCS.UPNIVEL3 A
LEFT JOIN PIMSCS.SAFRUPNIV3 B
ON A.CD_SAFRA = B.CD_SAFRA
AND A.CD_UPNIVEL1 = B.CD_UPNIVEL1
AND A.CD_UPNIVEL3 = B.CD_UPNIVEL3
WHERE A.CD_UNID_IND IN (15, 19)
AND A.CD_OCUP = 1
AND A.CD_SAFRA =
(SELECT MAX(CD_SAFRA) FROM PIMSCS.HISTPREPRO)
AND B.CD_SAFRA =
(SELECT MAX(CD_SAFRA) FROM PIMSCS.HISTPREPRO)
AND B.FG_OCORREN <> 'I'
AND B.DT_OCORREN =
(SELECT MAX(B2.DT_OCORREN)
FROM PIMSCS.SAFRUPNIV3 B2
WHERE B.CD_SAFRA = B2.CD_SAFRA
AND B.CD_UPNIVEL1 = B2.CD_UPNIVEL1
AND B.CD_UPNIVEL3 = B2.CD_UPNIVEL3)
GROUP BY A.CD_UPNIVEL1, A.CD_UPNIVEL3) C
ON a."Fazenda" = c."Zona"
AND a."Talhao" = c."Talhao") B
ON a."Chave" = b."Chave"
【问题讨论】：
【参考方案1】：你可以使用递归：
import sqlparse, re
def has_select(s):
if any(isinstance(i, sqlparse.sql.Token) and i.value.lower() == 'select' for i in getattr(s, 'tokens', [])):
yield s
else:
yield from [j for k in getattr(s, 'tokens', []) for j in has_select(k)]
def q_tree(s, alias=None):
c, f = [], None
for i in s:
if type(i) in (sqlparse.sql.Token,):
if re.findall('^from$|join$', i.value, re.I):
f = i.value
elif type(i) in (sqlparse.sql.Identifier, sqlparse.sql.IdentifierList, sqlparse.sql.Parenthesis) and f is not None:
if (s_stml:=next(has_select(i), None)) is not None:
c.append((f, q_tree(s_stml, None if not isinstance(i, sqlparse.sql.Identifier) else list(i)[-1].value)))
else:
fr = ''.join(str(j) for j in i if j.value not in 'as', '\n')
c.append((f, ['table':(t1:=t.split())[0], 'alias':None if len(t1) < 2 else t1[-1]
for t in re.findall('(?:\w+\.\w+|\w+)\s+\w+|(?:\w+\.\w+|\w+)', fr)]))
f = None
return 'query':c, 'alias':alias
print(q_tree(sqlparse.parse(query_string)[0]))
输出：
'query': [('FROM', 'query': [('FROM', 'query': [('FROM', 'query': [('FROM', ['table': 'PIMSCS.HISTPREPRO', 'alias': 'OBJ', 'table': 'PIMSCS.ESTAGIOS', 'alias': 'B', 'table': 'PIMSCS.UPNIVEL3', 'alias': 'UP3', 'table': 'PIMSCS.SAFRUPNIV3', 'alias': 'C', 'table': 'PIMSCS.VARIEDADES', 'alias': 'D', 'table': 'PIMSCS.TIPO_MATURAC', 'alias': 'E', 'table': 'PIMSCS.UPNIVEL1', 'alias': 'F', 'table': 'PIMSCS.FORNECS', 'alias': 'G'])], 'alias': None)], 'alias': 'A'), ('LEFT JOIN', 'query': [('FROM', ['table': 'PIMSCS.HISTPREPRO', 'alias': 'A'])], 'alias': 'B'), ('LEFT JOIN', 'query': [('FROM', ['table': 'PIMSCS.UPNIVEL3', 'alias': 'A']), ('LEFT JOIN', ['table': 'PIMSCS.SAFRUPNIV3', 'alias': 'B'])], 'alias': 'C')], 'alias': 'A'), ('FULL JOIN', 'query': [('FROM', 'query': [('FROM', 'query': [('FROM', ['table': 'PIMSCS.HISTPREPRO', 'alias': 'OBJ', 'table': 'PIMSCS.ESTAGIOS', 'alias': 'B', 'table': 'PIMSCS.UPNIVEL3', 'alias': 'UP3', 'table': 'PIMSCS.SAFRUPNIV3', 'alias': 'C', 'table': 'PIMSCS.VARIEDADES', 'alias': 'D', 'table': 'PIMSCS.TIPO_MATURAC', 'alias': 'E', 'table': 'PIMSCS.UPNIVEL1', 'alias': 'F', 'table': 'PIMSCS.FORNECS', 'alias': 'G'])], 'alias': None)], 'alias': 'A'), ('LEFT JOIN', 'query': [('FROM', ['table': 'PIMSCS.HISTPREPRO', 'alias': 'A'])], 'alias': 'B'), ('LEFT JOIN', 'query': [('FROM', ['table': 'PIMSCS.UPNIVEL3', 'alias': 'A']), ('LEFT JOIN', ['table': 'PIMSCS.SAFRUPNIV3', 'alias': 'B'])], 'alias': 'C')], 'alias': 'B')], 'alias': None
结果是一个嵌套字典，用于存储基本查询信息，包括别名，以及所有后续的joins、子查询和表。
【讨论】：
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