On Tuesday, 17 April 2018 23:17:27 UTC+2, su-sa wrote:
>
> Hi everyone!
>
> I am trying to build the following query with SQLAlchemy:
>
> "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;")
>
> But unfortunately, I am unable to figure out how to impose top 100 on the
> query,
> This is what I have upto now:
>
> 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').order_by(Supplier.s_acctbal.desc(), Nation.n_name, Part.p_partkey)
>
> It might be that I making some other mistake as well, because I get no result
> from the query upto now.
>
>
I am aware that I could use .limit(100), but was still curious to know if
there is somehow a way to use top instead.
>
> I would be really thankful if anyone of you could help me.
>
> Best Wishes,
> Sugandha
>
>
>
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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