Question

我想将一行中的多个值拆分为 sap hana sql中的单独行。表：

 id  name
 1   kabil,arasan

但我想要这样的输出：

id  name
1   kabil  
1   arasan

Answer 1

尽量避免在列中使用类似csv的数据，例如在ETL过程中规范化
您可以使用某个程序，请参阅[HANA: Split string?

没有过程，您可以使用以下SQL（限制：它假定您的csv字段中有最大数量的值）。我只会将它用于临时目的。

CREATE COLUMN TABLE "TEST_SPLIT"(
    "SOME_KEY" VARCHAR(10),
    "CSV_STR" VARCHAR(1000) );

INSERT INTO "TEST_SPLIT" ("SOME_KEY", "CSV_STR") VALUES ('1', 'hello world');
INSERT INTO "TEST_SPLIT" ("SOME_KEY", "CSV_STR") VALUES ('2', 'one,two,three');
INSERT INTO "TEST_SPLIT" ("SOME_KEY", "CSV_STR") VALUES ('3', NULL);

Select * from 
( select "SOME_KEY" "KEY", "ELEMENT_NUMBER" "ORD", 
       SUBSTR_REGEXPR('(?<=^|,)([^,]*)(?=,|$)' IN "TEST_SPLIT"."CSV_STR" OCCURRENCE "SERIES"."ELEMENT_NUMBER" GROUP 1) "VAL"
  from "TEST_SPLIT",
       SERIES_GENERATE_INTEGER(1, 1, 10 ) "SERIES" -- replace 10 with your max. number of values in CSV-Field
)
where "VAL" is not null
order by "KEY", "ORD"

[1]：HANA: Split string?

Answer 2

对SUBSTR_REGEXPR函数的使用进行了微调。上周，我在哈纳（Hana）将其用作Script_View，可以确认它是否有效。

Begin
VAR_OUT =
    select *
    from ( select
    ST.PARAM, -- Source table id
    NT.Element_Number, -- Occurrence number within source table row
SUBSTR_REGEXPR( '([;])([^;]*)(?=;)'
IN   CONCAT(CONCAT(';',ST.VALUE),';')
     OCCURRENCE NT.Element_Number
    GROUP 2
    ) splitted      -- string piece
from 
"_SYS_BIC"."Financial_Planning_and_Analysis/ZZTPARPAR_SOURCE" as ST, -- source  table
SERIES_GENERATE_INTEGER(1, 0, 10 ) as NT -- numbers table
    ) tbl
where splitted is not null
order by PARAM, Element_Number;
End

Before and After

如何将一行中的多个值拆分为单独的行？

2 个答案: