I have the a query which looks similar to:
SELECT
s.cola, s.colb, t.colc, t.cold, u.cole, u.colf, u.colg, u.colh, u.coli, u.colj, u.colk, u.coll
FROM table1 s
INNER JOIN table2 t
ON s.colb = t.colc
INNER JOIN table3 u
ON u.colm = t.cold
WHERE cast(s.cola as date) between date '2017-11-06' and date '2017-11-10'
ORDER BY 3
I need to add a new column, called col_new, which is to be filled by either u.colm or u.coln. This column will have values from u.colm if that column starts with a number. Otherwise it will have values from u.coln. It is known that either u.coln or u.colm starts with a number, for each entry in table u.
I tried the following query to test if entries starting with a number can be identified or not:
SELECT CASE WHEN ISNUMERIC(SUBSTRING(LTRIM(colm), 1, 1)) = 1
THEN 'yes'
ELSE 'no'
END AS col_new
FROM table_u
It returned the error: Syntax error: expected something between '(' and the 'substring' keyword.
Kindly suggest a solution.
Edit:
Exact Error:
[Teradata Database] [3706] Syntax error: expected something between '(' and the 'substring' keyword.
Instead of isnumeric(), just do a comparison:
SELECT (CASE WHEN LEFT(LTRIM(colm), 1) BETWEEN '0' AND '9' THEN 'yes'
ELSE 'no'
END) AS col_new
FROM table_u;
LEFT() is a convenient shorthand for the first "n" characters of a string.
Related
I have a code like that:
select
tbl.person
,COUNT(distinct tbl.project)
,if (tbl.stage like '%SIGNED%') then sum(tbl.value) else '0' end if as test
from
my_table tbl
group by
1
And it returns me that error message:
SQL Error [42601]: ERROR: syntax error at or near "then"
I didn't got it. As I saw on documentation, the if statement syntax appears to be used correctly
IF is to be used in procedures, not in queries. Use a case expression instead:
select
tbl.person
,COUNT(distinct tbl.project)
,sum(case when tbl.stage like '%SIGNED%' then tbl.value else 0 end) as test
from
my_table tbl
group by
1
Notes:
tbl.stage is not part of the group by, so it should most probably be enclosed within the aggregate expression, not outside of it
all values returned by a case expression need to have the same datatype. Since sum(tbl.value) is numeric, the else part of the case should return 0 (number), not '0' (string).
In Postgres, I would recommend using filter:
select tbl.person, COUNT(distinct tbl.project)
sum(tbl.value) filter (where tbl.stage like '%SIGNED%') as test
from my_table tbl
group by 1;
if is control flow logic. When working with queries, you want to learn how to think more as sets. So the idea is to filter the rows and add up the values after filtering.
replace
if (tbl.stage like '%SIGNED%') then sum(tbl.value) else '0' end if as test
with
sum(case when tbl.stage like '%SIGNED%' then tbl.value end) as test
here is the query, i want to use case statement with count function in oracle.
Select case when count(*) > 0 then 'doSomething' else 'doSomething'
from student where student_name='faizan ahmed' and student_father='ahmed' and UPPER(student_dob)=UPPER('01-FEB-19');
please help me out, using plsql code.
ORA-00905: missing keyword
00905. 00000 - "missing keyword"
For this purpose, use exists instead:
Select (case when exists (select 1
from student
where student_name = 'faizan ahmed' and
student_father = 'ahmed' and
upper(student_dob) = upper('01-FEB-19');
then 'doSomething'
else 'doSomethingElse'
end)
from dual;
EXISTS is usually more efficient than a count, because it can stop at the first matching row instead of aggregating the whole table.
You're missing an END for CASE:
SELECT CASE WHEN COUNT (*) > 0 THEN
'doSomething'
ELSE 'doSomething'
END --> This
FROM student
WHERE student_name = 'faizan ahmed'
AND student_father = 'ahmed'
AND UPPER (student_dob) = date '2019-02-01' -- No! UPPER ('01-FEB-19');
It is easier to spot if you format code you write.
Apart from that, STUDENT_DOB seems to be a date. If so, then don't compare it to a string (because '01-feb-19' IS a string) but to a date (date '2019-02-01' - it is a date literal, consists of the date keyword and yyyy-mm-dd value).
Also, it is strange that you used UPPER with that "date" string, but all your names are lowercase. Hm?
I need to filter out rows in table where numer_lini column has number in it and it is between 100 and 999, below code works just fine when i comment out line where i cast marsnr to integer. However when i try to use it i get error: Invalid character found in a character string argument of the function "INTEGER". when looking at the list seems like replace and translate filters only numbers just fine and select only contains legit numbers (list of unique values is not long so its easy to scan by eye). So why does it fail to cast something? I also tried using integer(marsnr), but it produces the same error. I need casting because i need numeric range, otherwise i get results like 7,80 and so on. As I mentioned Im using IBM DB2 database.
select numer_lini, war_trasy, id_prz1, id_prz2
from alaska.trasa
where numer_lini in (
select marsnr
from (
select
distinct numer_lini marsnr
from alaska.trasa
where case
when replace(translate(numer_lini, '0','123456789','0'),'0','') = ''
then numer_lini
else 'no'
end <> 'no'
)
where cast(marsnr as integer) between 100 and 999
)
fetch first 300 rows only
If you look at the optimized SQL from the Db2 explain, you will see that Db2 has collapsed your code into a single select.
SELECT DISTINCT Q2.NUMER_LINI AS "NUMER_LINI",
Q2.WAR_TRASY AS "WAR_TRASY",
Q2.ID_PRZ1 AS "ID_PRZ1",
Q2.ID_PRZ2 AS "ID_PRZ2",
Q1.NUMER_LINI
FROM ALASKA.TRASA AS Q1,
ALASKA.TRASA AS Q2
WHERE (Q2.NUMER_LINI = Q1.NUMER_LINI)
AND (100 <= INTEGER(Q1.NUMER_LINI))
AND (INTEGER(Q1.NUMER_LINI) <= 999)
AND (CASE WHEN (REPLACE(TRANSLATE(Q1.NUMER_LINI,
'0',
'123456789',
'0'),
'0',
'') = '') THEN Q1.NUMER_LINI
ELSE 'no' END <> 'no')
Use a CASE to force Db2 to do the "is integer" check first. Also, you don't check for the empty string.
E.g. with this table and data
create TABLE alaska.trasa (numer_lini VARCHAR(10), war_trasy INT , id_prz1 INT, id_prz2 INT);
insert into alaska.trasa values ('',1,1,1),('99',1,1,1),('500',1,1,1),('3000',1,1,1),('00300',1,1,1),('AXS',1,1,1);
This SQL works
select numer_lini, war_trasy, id_prz1, id_prz2
from alaska.trasa
where case when translate(numer_lini, '','0123456789') = ''
and numer_lini <> ''
then integer(numer_lini) else 0 end
between 100 and 999
Although that does fail if there is an embedded space in the input. E.g. '30 0'. To cater for that, a regular expressing is probably preferred. E.g.
select numer_lini, war_trasy, id_prz1, id_prz2
from alaska.trasa
where case when regexp_like(numer_lini, '^\s*[+-]?\s*((\d+\.?\d*)|(\d*\.?\d+))\s*$'))
then integer(numer_lini) else 0 end
between 100 and 999
I stumbled in a case where requires to mask data using keyword from other reference table, illustrated below:
1:
Table A contains thousands of keyword and Table B contains 15 millions ++ row for each day processing..
How can I replace data in table B using keyword in table A in new column?
I tried to use join but join can only match when the string exactly the same
Here is my code
select
sourcetype, hourx,minutex,t1.adn,hostname,t1.appsid,t1.taskid,
product_id,
location,
smsIncoming,
case
when smsIncoming regexp keyword = true then keyword
else 'undef' end smsIncoming_replaced
from(
select ... from ...
)t1
left join
(select adn,keyword,type,mapping_param,mapping_param_json,appsid,taskid,is_api,charlentgh,wordcount,max(datex)
from ( select adn,keyword,type,mapping_param,mapping_param_json,appsid,taskid,is_api,charlentgh,wordcount,datex ,last_update,
max(last_update) over (partition by keyword) as last_modified
from sqm_stg.reflex_service_map ) as sub
where last_update = last_modified
group by adn,keyword,type,mapping_param,mapping_param_json,appsid,taskid,is_api,charlentgh,wordcount)t2
on t1.adn=t2.adn and t1.appsid=t2.appsid and t1.taskid=t2.taskid
Need advice :)
Thanks
Use instr(string str, string substr) function: Returns the position of the first occurrence of substr in str. Returns null if either of the arguments are null and returns 0 if substr could not be found in str. Be aware that this is not zero based. The first character in str has index 1.
case
when instr(smsIncoming,keyword) >0 then keyword
else 'undef'
end smsIncoming_replaced
I am using the following SQL CASE:
SELECT
BomMast.BomStockCode
, BomMast.BomDescription
, CASE
WHEN StkItem.AveUCst <= 0 THEN 'ERROR'
WHEN StkItem.AveUCst > 0 THEN (StkItem.AveUCst * BomComp.ProductionQty)
END AS TotalCost
FROM BomComp
INNER JOIN BomMast
ON BomMast.BomID = BomComp.BomMasterKey
INNER JOIN StkItem
ON StkItem.StockLink = BomComp.ComponentStockLink
But I get the following message:
Msg 8114, Level 16, State 5, Line 2
Error converting data type varchar to float.
Am I not allowed to add test within the CASE statement?
Thank you!
Change your query to:
SELECT BomMast.BomStockCode
,BomMast.BomDescription
,CASE
WHEN StkItem.AveUCst <= 0
THEN 'ERROR'
WHEN StkItem.AveUCst > 0
THEN CAST((StkItem.AveUCst * BomComp.ProductionQty) AS NVARCHAR(MAX))
END AS TotalCost
FROM BomComp
INNER JOIN BomMast ON BomMast.BomID = BomComp.BomMasterKey
INNER JOIN StkItem ON StkItem.StockLink = BomComp.ComponentStockLink
The datatypes of the values you want to show in either branches of your CASE statements need to be the same in order to work.
Edit:
After #underscore_d's suggestion, I also consider that it would be a far better option to display NULL instead of the message ERROR and then handle this NULL value in the application level.
Hence, your case statement will change to:
CASE
WHEN StkItem.AveUCst <= 0
THEN NULL
WHEN StkItem.AveUCst > 0
THEN (StkItem.AveUCst * BomComp.ProductionQty)
END AS TotalCost
Yes, text can be used as the result a case statement, as can any datatype, but each case must return the same type, as the results column must have one type only.
Your [TotalCost] column has conflicting data types. [StkItem.AveUCst] is a float and the literal value of 'ERROR' is a varchar. If you are intending to retain the benefits of number-based value in your results column, consider replacing 'ERROR' with the SQL keyword NULL.
Your column TotalCost (neither any other column) can be a type-mixture. In first case it would be a varchar, in second case it would be floator something like that. THAT IS NOT POSSIBLE.