How to find the highest numbered version of text? - sql

Question

How to find the highest numbered version of text? For example I have the data with text+digit:
Supra1, Supra2,...,SupraN in column1: translated_description.
select
*
from
oe.product_descriptions
where
translated_description like '%Supra%';
I need to extract the value from another column (column2) for the highest number e.g. N=30 for Supra30 in column1.

Answer 1

If all of the values in column1 have numbers with the same number of digits, you can order by it and use the fetch first syntax:
SELECT column2
FROM mytable
WHERE column1 LIKE 'Supra%'
ORDER BY column1 DESC
FETCH FIRST ROW ONLY
If the number of digits in column1 varies, you'll have to extract them, convert the number, and sort numerically:
SELECT column2
FROM mytable
WHERE column1 LIKE 'Supra%'
ORDER BY TO_NUMBER(REPLACE(column1, 'Supra', '')) DESC
FETCH FIRST ROW ONLY

Answer 2

Try using regexp_substr to extract the number and then apply max on it:
SELECT max(to_number(regexp_substr(t.translated_description, 'Supra([0-9]+)', 1, 1, NULL, 1)))
FROM oe.product_descriptions t
This will extract the number, assuming that the format of the content of the column is SOMETEXTnumber

Answer 3

If there could be more than 1 Supra in the column and if the numbers after the word supra could be 1 or 2 then (just for testing) you could have data like this:
WITH
tbl AS
(
Select 1 "ID", '10GB Removable HDD ... Supra7 disk drives ... transfer rate up to 160MB/s' "COL_1" From Dual Union All
Select 2 "ID", 'Some words ... Supra9 some more words ... and numbers 16 - 32GB' "COL_1" From Dual Union All
Select 3 "ID", 'Words, words, ... Supra12, and Supra13 are considered better than Supra15... words, words' "COL_1" From Dual
),
In this case you should check where the Supra words are located within the string and get ridd of everyting infront. So, here is a cte checking for three words Supra within the text:
supras AS
(
Select
ID,
CASE WHEN InStr(Upper(COL_1), 'SUPRA', 1, 1) > 0 THEN SubStr(COL_1, InStr(Upper(COL_1), 'SUPRA', 1, 1)) END "SUPRA_1",
CASE WHEN InStr(Upper(COL_1), 'SUPRA', 1, 2) > 0 THEN SubStr(COL_1, InStr(Upper(COL_1), 'SUPRA', 1, 2)) END "SUPRA_2",
CASE WHEN InStr(Upper(COL_1), 'SUPRA', 1, 3) > 0 THEN SubStr(COL_1, InStr(Upper(COL_1), 'SUPRA', 1, 3)) END "SUPRA_3"
From
tbl
)
ID SUPRA_1 SUPRA_2 SUPRA_3
---------- ----------------------------------------------------------------------------------------- ------------------------------------------------------------- --------------------------
1 Supra7 disk drives ... transfer rate up to 160MB/s
2 Supra9 some more words ... and numbers 16 - 32GB
3 Supra12, and Supra13 are considered better than Supra15... words, words Supra13 are considered better than Supra15... words, words Supra15... words, words
And, finaly, this resulting dataset could be transformed to just numbers among which you should select the MAX one:
-- Main SQL
SELECT MAX(GREATEST(SUPRA_1, SUPRA_2, SUPRA_3)) "MAX_SUPRA"
FROM
(
Select
ID,
CASE WHEN INSTR('0123456789', SubStr(SUPRA_1, 6, 1)) > 0 And INSTR('0123456789', SubStr(SUPRA_1, 7, 1)) > 0 THEN To_Number(SubStr(SUPRA_1, 6, 2))
WHEN INSTR('0123456789', SubStr(SUPRA_1, 6, 1)) > 0 THEN To_Number(SubStr(SUPRA_1, 6, 1))
ELSE 0
END "SUPRA_1",
--
CASE WHEN INSTR('0123456789', SubStr(SUPRA_2, 6, 1)) > 0 And INSTR('0123456789', SubStr(SUPRA_2, 7, 1)) > 0 THEN To_Number(SubStr(SUPRA_2, 6, 2))
WHEN INSTR('0123456789', SubStr(SUPRA_2, 6, 1)) > 0 THEN To_Number(SubStr(SUPRA_2, 6, 1))
ELSE 0
END "SUPRA_2",
--
CASE WHEN INSTR('0123456789', SubStr(SUPRA_3, 6, 1)) > 0 And INSTR('0123456789', SubStr(SUPRA_3, 7, 1)) > 0 THEN To_Number(SubStr(SUPRA_3, 6, 2))
WHEN INSTR('0123456789', SubStr(SUPRA_3, 6, 1)) > 0 THEN To_Number(SubStr(SUPRA_3, 6, 1))
ELSE 0
END "SUPRA_3"
From
supras
)
MAX_SUPRA
----------
15
-- Below is result of the inner query in main sql
ID SUPRA_1 SUPRA_2 SUPRA_3
---------- ---------- ---------- ----------
1 7 0 0
2 9 0 0
3 12 13 15

Answer 4

if you use SQL SERVER ,you can try this Query:
select ID as Column1,CONVERT(INT,SUBSTRING(ID,6, (LEN(ID)-5))) as Column2
from T
order by CONVERT(INT,SUBSTRING(ID,6, (LEN(ID)-5))) desc