On Wednesday, 18 April 2018 12:18:51 UTC+2, su-sa wrote:
>
>
>
> Hi everyone,
>
> I've been trying quite a while to reproduce the following query:q2 = text(
> "select top 100 s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address,
> s_phone, s_comment from system.part, "
> "system.supplier, system.partsupp, system.nation, system.region where
> p_partkey = ps_partkey "
> "and s_suppkey = ps_suppkey and p_size = 15 and p_type like '%BRASS' and
> s_nationkey = n_nationkey "
> "and n_regionkey = r_regionkey and r_name = 'EUROPE' and ps_supplycost =
> (select min(ps_supplycost) "
> "from system.partsupp, system.supplier, system.nation, system.region
> where p_partkey = ps_partkey "
> "and s_suppkey = ps_suppkey and s_nationkey = n_nationkey and n_regionkey
> = r_regionkey and r_name = 'EUROPE')"
> " order by s_acctbal desc, n_name, s_name, p_partkey;")
>
>
> Thats what I have currently:
>
> q2 = session.query(Supplier.s_acctbal, Supplier.s_name, Nation.n_name,
> Part.p_partkey, Part.p_mfgr,
> Supplier.s_address, Supplier.s_phone,
> Supplier.s_comment).filter(Part.p_partkey == Partsupp.ps_partkey,
> Supplier.s_suppkey== Partsupp.ps_suppkey, Part.p_size ==
> 15, Part.p_type.like('%BRASS'),
> Supplier.s_nationkey == Nation.n_nationkey,
> Nation.n_regionkey == Region.r_regionkey,
> Region.r_name == 'Europe', Partsupp.ps_supplycost ==
> func.min(Partsupp.ps_supplycost).filter(Part.p_partkey == Partsupp.ps_partkey,
> Supplier.s_suppkey == Partsupp.ps_suppkey,
> Supplier.s_nationkey == Nation.n_nationkey,
> Nation.n_regionkey == Region.r_regionkey, Region.r_name ==
> 'EUROPE')).order_by(Supplier.s_acctbal.desc(),
> Nation.n_name, Part.p_partkey).limit(100)
>
> But I am getting the error:
>
> sqlalchemy.exc.DBAPIError: (hdbcli.dbapi.Error) (257, 'sql syntax error:
> incorrect syntax near "FILTER": line 3 col 301 (at pos 649)')
> [SQL: u'SELECT supplier.s_acctbal AS supplier_s_acctbal, supplier.s_name AS
> supplier_s_name, nation.n_name AS nation_n_name, part.p_partkey AS
> part_p_partkey, part.p_mfgr AS part_p_mfgr,
> supplier.s_address AS supplier_s_address, supplier.s_phone AS
> supplier_s_phone, supplier.s_comment AS supplier_s_comment \nFROM supplier,
> nation, part, partsupp, region \nWHERE part.p_partkey = partsupp.ps_partkey
> AND supplier.s_suppkey = partsupp.ps_suppkey AND part.p_size = ? AND
> part.p_type LIKE ? AND supplier.s_nationkey = nation.n_nationkey AND
> nation.n_regionkey = region.r_regionkey AND region.r_name = ? AND
> partsupp.ps_supplycost = min(partsupp.ps_supplycost) FILTER (WHERE
> part.p_partkey = partsupp.ps_partkey AND supplier.s_suppkey =
> partsupp.ps_suppkey AND supplier.s_nationkey = nation.n_nationkey AND
> nation.n_regionkey = region.r_regionkey AND region.r_name = ?) ORDER BY
> supplier.s_acctbal DESC, nation.n_name, part.p_partkey\n LIMIT ?']
> [parameters: (15, '%BRASS', 'Europe', 'EUROPE', 100)]
> (Background on this error at: http://sqlalche.me/e/dbapi)
>
>
> Which makes sense because inside the generated SQL Query, also the word
> filter is present which is not recognised and because the nested select
> statement is not generated.
>
> Could anyone of you tell me what I doing wrong?
>
>
> Sorry if that seems to be a stupid question.
>
> Greetings,
> Sugandha
>
>
I also did the following:
q2 = session.query(Supplier.s_acctbal, Supplier.s_name, Nation.n_name,
Part.p_partkey, Part.p_mfgr,
Supplier.s_address, Supplier.s_phone,
Supplier.s_comment).filter(Part.p_partkey == Partsupp.ps_partkey,
Supplier.s_suppkey== Partsupp.ps_suppkey, Part.p_size == 15,
Part.p_type.like('%BRASS'),
Supplier.s_nationkey == Nation.n_nationkey,
Nation.n_regionkey == Region.r_regionkey,
Region.r_name == 'Europe', Partsupp.ps_supplycost ==
session.query(func.min(Partsupp.ps_supplycost)).filter(Part.p_partkey ==
Partsupp.ps_partkey,
Supplier.s_suppkey == Partsupp.ps_suppkey,
Supplier.s_nationkey == Nation.n_nationkey,
Nation.n_regionkey == Region.r_regionkey, Region.r_name ==
'EUROPE').correlate(Partsupp, Supplier, Nation,
Region)).order_by(Supplier.s_acctbal.desc(),
Nation.n_name, Part.p_partkey).limit(100)
But this gives me a new error:
The column 'SUPPLIER.S_ACCTBAL' is invalid in the ORDER BY clause because the
GROUP BY clause or an aggregation function does not contain it.
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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