I have a column and I would like to get a new column using only the first two characters. I would have assumed the following should work, but it throws FROM keyword not found where expected error
SELECT *,
SUBSTR(PHONE_NUMBER , 1,2) AS MY_PHONE_NUMBER
FROM PHONE_NOS;
Try it here
Alias the table and use it in the statement:
SELECT p.*,
SUBSTR(p.PHONE_NUMBER, 1, 2) AS MY_PHONE_NUMBER
FROM PHONE_NOS p;
Related
How do I get the column "count(division)" instead of getting the actual number of counts?
select * from num_taught;
gets me this
select count(division) from num_taught;
gets me this, but I actually want the third column "count(division)" from the previous image
I want to know this because I'm doing this right now:
sql> select * from num_taught as a, num_taught as b
...> where a.count(division) = b.count(division);
Error: near "(": syntax error
but as you can see, there's a syntax error and I think it's because the code is not referencing the "count(division)" columns but actually finding the count instead.
My end goal is to output the "Titles" that have the same "Division" and have the same count(division).
So for example, the end table would have the rows "Chief Accountant", "Programmer Trainee", "Scrivener", "Technician", "Wizard". Since these are the rows that have a match in division and count(division)
Thanks!
What does DESC num_taught return? I am curious how the third column is populated - is it some kind of pseudo-column? You may want try wrapping the column name with [], see: How to deal with SQL column names that look like SQL keywords?
i.e. try:
select [count(division)] from num_taught;
You need to escape your column name using quotes (in case it's Sqlite like you mentioned in the comments).
select "count(division)" from num_taught;
or:
select * from num_taught as a, num_taught as b
where a."count(division)" = b."count(division)";
If you don't you are using the count-function provided by your Database-system.
It's very unusual to name a column like this, it might be either a trap by your tutor or an error while initializing the table in your case.
I think you just want a count(distinct):
select count(distinct division)
from num_taught;
I'm trying to get a substring from the value of a column and I'm getting the following error Argument data type varchar is invalid for argument 2 of substring function.
The column type is NvarChar(50) and is a system column for an application, so I can't modify it.
Ideally I'd just be able to select the substring as part of the query without having to alter the table, or create a view or another table.
Here's my query
SELECT SUBSTRING(INVOICE__, ':', 1)
FROM dwsystem.dbo.DWGroup
Im trying to select only everything in the string after a specific character. In this case the : character.
Use charindex with : as the first argument
select substring(invoice__,charindex(':',invoice__)+1,len(invoice__))
from dwsystem.dbo.dwgroup
SUBSTRING parameter is start position and end position so both parameter will be number like below
SELECT SUBSTRING(INVOICE__, 1, 1)
FROM dwsystem.dbo.DWGroup
you can use SUBSTRING_INDEX as you used mysql
SELECT SUBSTRING_INDEX(INVOICE__,':',-1);
example
SELECT SUBSTRING_INDEX('mytestpage:info',':',-1); it will return
info
I am running the below mentioned query in my Oracle client and i am getting
ORA-01722: invalid number
error. I know the issue is due to the TAG_VALUE column being of type "varchar2" and i am converting it to number and then using that field in where clause. I have tried using "CAST" function but that is also not helping.
If i run the query neglecting the last where condition with code WHERE (P.TAG_VALUE > '100') then i am getting the result but including the last where clause gives me error.
SELECT DISTINCT
count(P.CREATED_DATETIME)
FROM
(
select OUTPUT_TAG_ID,TO_NUMBER(TAG_VAL,'9999.99') AS
TAG_VALUE,TAG_VAL_TS,CREATED_DATETIME
from OV80STG.PRCSD_DATA_OUTPUT_ARCHIVE
where MODEL_CODE='MDLADV1538'
AND TAG_VAL <> 'U_Transfer_rate'
) P
WHERE
(P.TAG_VALUE > '100')
Any suggestion will be appreciated. Thanks.
Remove the single quotes from around the value in the where, you don't need them when its an integer. query will be like this:
SELECT DISTINCT
COUNT(P.CREATED_DATETIME)
FROM
(
SELECT
OUTPUT_TAG_ID,
TO_NUMBER(TAG_VAL, '9999.99') AS TAG_VALUE,
TAG_VAL_TS,
CREATED_DATETIME
FROM OV80STG.PRCSD_DATA_OUTPUT_ARCHIVE
WHERE MODEL_CODE = 'MDLADV1538'
AND TAG_VAL <> 'U_Transfer_rate'
) P
WHERE(P.TAG_VALUE > 100);
TO_NUMBER function returns a numeric value so, as mentioned in comment, you shouldn't compare it with string value.
I solved the issue by including outer where clause inside the subquery and then I got the required result without any error.
When I run my query in management studio it works fine, but in a stream analytics job it throws an error: Query compilation error: Invalid column name: 'afkorting'. Column with such name does not exist..
I downloaded the input tables to check if something went wrong with uploading, but that file does have that column name (and I double checked for capital letters, miswriting etc), so how can I fix this?
This is my query:
; WITH Check AS
(
SELECT afkorting, *
FROM Reizen RE
LEFT JOIN Gegevens AP
ON RE.ID = AP.code
)
SELECT *
FROM Check CH
JOIN Model VM
ON CH.afkorting = VM.Station
WHERE VM.h_station = VM.v_station
AND DATEPART(hour, CH.MsgReportDate) = VM.start_uur
AND (DATEPART(minute, CH.MsgReportDate) BETWEEN VM.start_minuut AND VM.eind_minuut)
AND DATEPART(weekday, CH.MsgReportDate) = VM.weekdag
Hope someone can help me!
*PROBLEM SOLVED: you need to give in all columnnames, so not SELECT * but SELECT column1, column2 and use the given prefixes of the table, in my case: AP.column1, RE.column2 etc*
Just summarize all comments above for resolving the issue, I did some testing for Stream Query language elements WITH, SELECT & JOIN. Here is my result list for the issue.
Without JOIN, using column names with symbol * in the WITH scope is correct for executing on ASA.
With JOIN, it's necessary to list all column names you want without symbol * for executing. The reason seems to be to avoid ambiguity with column name conflict.
you need to give in all column names, so not
SELECT * but SELECT column1, column2
and use the given prefixes of the table,
for example
in my case:
AP.column1, RE.column2 etc
This query fails:
SELECT xpath('/my/xpath/expr', my_xml)[1] FROM my_table
ERROR: syntax error at or near "["
But this one works:
SELECT x[1] FROM
(SELECT xpath('/my/xpath/expr', my_xml) as x FROM my_table) as ss
My xpath expression always returns only a single value, but the Postgres xpath function returns an array. I want to select the first value in the array. While the subselect works, it's pretty ugly.
Why doesn't the first query work, and is there a cleaner way to do this than the second query?
How about this:
SELECT (xpath('/my/xpath/expr', my_xml))[1] FROM my_table;