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I think I can only get value, subtract value (at Java) and update value. Is it possible to subtract value at cell at one query?
Yes, but you got the syntax a bit wrong:
UPDATE table SET number_of_people = number_of_people - 3 WHERE id = 487364
This assumes that number_of_people is an integer value.
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I have one query in DB2 which use 'for fetch only' but I need to convert it into postgresql. What can we use it for that?
You don't need that in PostgreSQL. In PostgreSQL, any cursor can be used for a positioned UPDATE or DELETE.
Just omit the clause in PostgreSQL.
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I have a table with field name out of type text
I want to get the rows which contains sub string "hello and good morning"
I have tried to write:
select *
from my_table
where out like 'hello and good morning%'
but it seems not working.
How can I get all the rows which contains sub string ?
According to given details, this should work.
select * from my_table where LOWER(out) like LOWER('%hello and good morning%')
Here is the fiddle.
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How can I create a calculated field in Tableau that shows me the following;
it should exclude weekdays working hours between 08:00 am-16:00pm
It should include full weekends.
Trying to find who is login to the system after working hours.
Thanks a lot,
Assuming that you want to flag unauthorised logins, I have done it like that-
Sample data I have used-
Calculated field unauth_login like this
DATEPART('iso-weekday', [Login_time]) >5
OR
DATEPART('hour', [Login_time])>=16
OR
DATEPART('hour', [Login_time])<8
and you will your desired results with yes values flagged separately from no. Screenshot
Do tell me whether I got you correct?
Assumption: Saturday and Sunday are weekends are in your country/locale.
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How can we get this output
results from query should be like:
Assessment
penalty
both values are coming from two different columns. I want to join these two columns but want results like above in single cell. so there should be new line for second column(but in same cell)
select assessment || E'\n' || penalty from wherever
or
select concat_ws(chr(10), assessment, penalty) from wherever
Note: I am assuming, since you didn't say, that neither column can be null.
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how can I understand which property or properties were updated and can I understand on which row or get the current row? Thanks.
If the row has a unique identifier, NEW.id will hold the value of that identifier within the trigger function. In order to see whether the value has been updated you can compare OLD.columnname vs NEW.columnname
You can add
RAISE NOTICE 'id of row: %', NEW.id;
to see the values in the output