卡桑德拉字符串比较选择查询不起作用

select * from customer where cust_city = 'Mumbai' allow filtering;

当我运行此查询时，结果只显示列名，而不是如果我给出where子句中的整数值，我得到输出。卡桑德拉字符串比较选择查询不起作用

select * from customer where payment_amt=7000 allow filtering;

表数据

cust_code | agent_code | cust_city  | cust_country | cust_name  | grade | opening_amt | outstanding_amt | payment_amt | phone_no  | receiveamt | working_area 
-------------+--------------+---------------+----------------+---------------+-------+-------------+-----------------+-------------+----------------+------------+---------------- 
    C00011  | A010  | Chennai  | India   | Sundariya |  3 |  7000 |   11000 |  7000 | PPHGRTS  |  1000 | Chennai 
    C00012  | A012  | San Jose  | USA   | Steven  |  1 |  5000 |   3000 |  9000 | KRFYGJK  |  000 | San Jose 
    C00013  | A003  | London  | UK   | Holmes  |  2 |  6000 |   4000 |  7000 | BBBBBBB  |  000 | London 
    C00014  | A001  | Bangalore | India   | Rangarappa |  2 |  8000 |   12000 |  7000 | AAAATGF  |  1000 | Bangalore 
    C00018  | A005  | Brisban  | Australia  | Fleming  |  2 |  7000 |   5000 |  9000 | NHBGVFC  |  000 | Brisban 
    C00015  | A003  | London  | UK   | Stuart  |  1 |  6000 |   11000 |  3000 | GFSGERS  |  000 | London 
    C00004  | A005  | Brisban  | Australia  | Winston  |  1 |  5000 |   6000 |  7000 | AAAAAAA  |  000 | Brisban 
    C00022  | A002  | Mumbai  | India   | Avinash  |  2 |  7000 |   9000 |  9000 | 113-12345678 |  1000 | Mumbai 
    C00001  | A008  | New York  | USA   | Micheal  |  2 |  3000 |   6000 |  2000 | CCCCCCC  |  000 | New York 
    C00021  | A005  | Brisban  | Australia  | Jacks  |  1 |  7000 |   7000 |  7000 | WERTGDF  |  000 | Brisban 
    C00023  | A006  | London  | UK   | Karl   |  0 |  4000 |   3000 |  7000 | AAAABAA  |  000 | London 
    C00006  | A004  | Torento  | Canada  | Shilton  |  1 |  10000 |   11000 |  6000 | DDDDDDD  |  000 | Torento 
    C00008  | A004  | Torento  | Canada  | Karolina  |  1 |  7000 |   5000 |  9000 | HJKORED  |  000 | Torento 
    C00016  | A007  | Bangalore | India   | Venkatpati |  2 |  8000 |   12000 |  7000 | JRTVFDD  |  1000 | Bangalore 
    C00002  | A008  | New York  | USA   | Bolt   |  3 |  5000 |   3000 |  9000 | DDNRDRH  |  000 | New York 
    C00019  | A010  | Chennai  | India   | Yearannaidu |  1 |  8000 |   8000 |  7000 | ZZZZBFV  |  000 | Chennai 
    C00010  | A009  | Hampshair | UK   | Charles  |  3 |  6000 |   5000 |  5000 | MMMMMMM  |  000 | Hampshair 
    C00009  | A002  | Mumbai  | India   | Ramesh  |  3 |  8000 |   12000 |  3000 | Phone No  |  000 | Mumbai 
    C00020  | A008  | New York  | USA   | Albert  |  3 |  5000 |   6000 |  6000 | BBBBSBB  |  000 | New York 
    C00017  | A007  | Bangalore | India   | Srinivas  |  2 |  8000 |   9000 |  3000 | AAAAAAB  |  000 | Bangalore 
    C00025  | A011  | Bangalore | India   | Ravindran |  2 |  5000 |   8000 |  4000 | AVAVAVA  |  000 | Bangalore 
    C00005  | A002  | Mumbai  | India   | Sasikant  |  1 |  7000 |   11000 |  7000 | 147-25896312 |  1000 | Mumbai 
    C00003  | A004  | Torento  | Canada  | Martin  |  2 |  8000 |   8000 |  7000 | MJYURFD  |  000 | Torento 
    C00024  | A006  | London  | UK   | Cook   |  2 |  4000 |   6000 |  7000 | FSDDSDF  |  000 | London 
    C00007  | A010  | Chennai  | India   | Ramanathan |  1 |  7000 |   9000 |  9000 | GHRDWSD  |  1000 | Chennai

输出1（串）

cust_code | agent_code | cust_city | cust_country | cust_name | grade | opening_amt | outstanding_amt | payment_amt | phone_no | receive_amt | working_area 
-----------+------------+-----------+--------------+-----------+-------+-------------+-----------------+-------------+----------+-------------+-------------- 

(0 rows)

输出2（整数）

cust_code | agent_code | cust_city  | cust_country | cust_name  | grade | opening_amt | outstanding_amt | payment_amt | phone_no  | receive_amt | working_area 
-------------+--------------+---------------+----------------+---------------+-------+-------------+-----------------+-------------+----------------+-------------+---------------- 
    C00011  | A010  | Chennai  | India   | Sundariya |  3 |  7000 |   11000 |  7000 | PPHGRTS  |  11000 | Chennai 
    C00013  | A003  | London  | UK   | Holmes  |  2 |  6000 |   4000 |  7000 | BBBBBBB  |  5000 | London 
    C00014  | A001  | Bangalore | India   | Rangarappa |  2 |  8000 |   12000 |  7000 | AAAATGF  |  11000 | Bangalore 
    C00004  | A005  | Brisban  | Australia  | Winston  |  1 |  5000 |   6000 |  7000 | AAAAAAA  |  8000 | Brisban 
    C00021  | A005  | Brisban  | Australia  | Jacks  |  1 |  7000 |   7000 |  7000 | WERTGDF  |  7000 | Brisban 
    C00023  | A006  | London  | UK   | Karl   |  0 |  4000 |   3000 |  7000 | AAAABAA  |  6000 | London 
    C00016  | A007  | Bangalore | India   | Venkatpati |  2 |  8000 |   12000 |  7000 | JRTVFDD  |  11000 | Bangalore 
    C00019  | A010  | Chennai  | India   | Yearannaidu |  1 |  8000 |   8000 |  7000 | ZZZZBFV  |  7000 | Chennai 
    C00005  | A002  | Mumbai  | India   | Sasikant  |  1 |  7000 |   11000 |  7000 | 147-25896312 |  11000 | Mumbai 
    C00003  | A004  | Torento  | Canada  | Martin  |  2 |  8000 |   8000 |  7000 | MJYURFD  |  7000 | Torento 
    C00024  | A006  | London  | UK   | Cook   |  2 |  4000 |   6000 |  7000 | FSDDSDF  |  9000 | London 

(11 rows)

有人能帮助这一点。

来源

2017-08-08 Shinoy Shaji

显示第二查询 –

井的输出，使用了'ALLOW FILTERING'。这是你的第一个问题。另外，很难知道这些查询如何在没有看到表定义的情况下运行。 – Aaron

我编辑了这个问题，并添加了表格条目和输出 –

确保选中确保没有在cust_city领域

您正在使用允许过滤没有开头和结尾的空间。小心。使用允许筛选执行此查询可能不是一个好主意，因为它可以使用大量计算资源，并且可能由于超时而不返回任何结果。不要使用允许生产筛选阅读有关使用允许过滤的

https://docs.datastax.com/en/cql/3.3/cql/cql_reference/select_r.html?hl=allow,filter

相反，你应该在cust_city场创建索引的文档datastax。

CREATE INDEX cust_city_index ON customer (cust_city);

现在，您使用cust_city过滤的选择查询将会更快。

何时不使用索引？

http://docs.datastax.com/en/cql/3.1/cql/ddl/ddl_when_use_index_c.html#concept_ds_sgh_yzz_zj__when-no-index

来源

2017-08-08 10:56:30

卡桑德拉字符串比较选择查询不起作用

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