How To Split Multiple Values From A Row Into Separate Rows?

I want to split multiple values from a row into a separate row in sap hana sql. table : id name 1 kabil,arasan but I want an output like this: id name 1 kabil 1 aras

Solution 1:

1. try to avoid csv-like data in columns, e.g. normalize during ETL process
2. you can use a procedure, see [HANA: Split string?

3. without a procedure you can use the following SQL (restriction: it assumes a maximum number of values in your csv-field). I would use it only for adhoc purposes.

   CREATECOLUMNTABLE "TEST_SPLIT"(
       "SOME_KEY" VARCHAR(10),
       "CSV_STR" VARCHAR(1000) );
   
   INSERTINTO "TEST_SPLIT" ("SOME_KEY", "CSV_STR") VALUES ('1', 'hello world');
   INSERTINTO "TEST_SPLIT" ("SOME_KEY", "CSV_STR") VALUES ('2', 'one,two,three');
   INSERTINTO "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" GROUP1) "VAL"
     from "TEST_SPLIT",
          SERIES_GENERATE_INTEGER(1, 1, 10 ) "SERIES" -- replace 10 with your max. number of values in CSV-Field
   )
   where "VAL" isnotnullorderby "KEY", "ORD"
   

   [1]: HANA: Split string?

Solution 2:

Slight tweaking of the use of the SUBSTR_REGEXPR function. I've used this just last week in Hana as a Script_View and can confirm it works.

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
    GROUP2
    ) splitted      -- string piecefrom 
"_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 isnotnullorderby PARAM, Element_Number;
End

Before and After