i simply have two fields. dtStartTime and dtStartDate.
I want to do a query now which returns one combined field dtStart using SQLite
I have tried
SELECT (dtStartDate+dtStartTime) as dtStart1, from ...
but it returns wrong values...
Thank you, shorty
PS: Dates are stored as unixepoch
SELECT datetime(d, t)
FROM (
SELECT date('now') as d, time('now') as t) as dt;
probably:
SELECT DATETIME(DATE(dtStartDate) || ' ' || TIME(dtStartTime)) FROM YourTable;
Related
select DATE(Orders.OrderDate,'10 DAY') from Orders. it will give the following result "1996-07-14"
When using column name directly instead of value in numeric it will give the empty result
select DATE(Orders.OrderDate,'Orders.OrderId DAY') from Orders.
What wrong with the above select query?
Try concatenating a string using the OrderId column:
SELECT DATE(Orders.OrderDate, '+' || Orders.OrderId || ' DAYS')
FROM Orders
You want a query of the form
SELECT DATE(Orders.OrderDate, '+7 DAYS') FROM Orders
and string concatenation will let you achieve that.
I am very new to Oracle 11g and am trying to generate a large string by appending text for each column in a select statement and using a cursor to store the results. However I want the last statement to not have a union all included. The final result I want to build large string of each row generated or simply execute the result if possible.
Note: column1 has a list of schemas that I am interested in.
select 'select * from ' || column1 || '.' || column2 || ' union all ' from mytable
This is where column1 is the schema, column2 is the table name.
What is the simplest way to generate the final string without using rtrim to remove the last string. And is there a simple way to append all these rows together in the string automatically?
The final goal is to actually just execute the union into a resulting cursor.
If you're querying in a loop anyway I wouldn't try to construct the string as part of the select at all; I'd do it all within the loop. Something like (untested):
declare
str varchar2(32768);
begin
for rec in (select column1, column2, rownum as rn from mytable)
loop
if rec.rn > 1 then
str := str || ' union all ';
end if;
str := str || 'select * from "' || rec.column[ || '"."' || rec.column2 ||'"';
end loop;
-- do something with str e.g. display to verify the syntax
-- before using in a cursor
dbms_output.put_line(str);
end;
Rather than adding union all to the end of every row except the last one,the rn check means it's added to the start of every row except the first one, which is easier to detect.
I've also wrapped the schema and table names in double quotes, just in case you have to deal with any quoted identifiers. But if your stored values don't match the case of the owners and table names in all_tables this will cause a problem rather than solve it.
I just want to concat two columns with seperator '-'.
These are the two columns, want to concat.
I am using this query to concat them
select concat(amt,endamt)as amount from mstcatrule
and it is giving me result this
But I Want that data of 2 columns should be sepearted by '-'
RESULT I WANT IS :
AMOUNT
0-0
100-99999999999
100-500
Alternative:
select amt || '-' || endamt as amount from mstcatrule;
Do it with two concats:
select concat(concat(amt, '-'), endamt) as amount from mstcatrule;
concat(amt,'-') concatenates the amt with the dash and the resulting string is concatenated with endamt.
Another way is to use double pipe.
select amt || '-' || endamt as amount from mstcatrule;
You may have to convert amt and endamt to varchar
In oracle this works for me! :D
select amt||'-'||endamt as amount from mstcatrule
Alternative you can use under query
select concat(amt,'-',endamt) as amount from mstcatrule;
A generic format for the query
Select concat(column1,'-',column2) as concatedCols from table_Name
For Postgresql only
In short: I need to calculate the ending datetime given starting time and length in minutes.
I have a table with columns StartTime (type datetime) and LengthMinutes (type int). To calculate the ending time I would need some sql like this:
select datetime(StartTime, '+LengthMinutes minutes') from my_table;
How do I refer to the column LengthMinutes from within the modifier?
Edited: solved using dan04's suggestion. Thanks!
SELECT datetime(StartTime, '+' || LengthMinutes || ' minutes') FROM my_table;
select datetime(strftime('%s',StartTime)+lengthMinutes*60,'unixepoch') from my_table;
I am using a not equal operator <> in my sql statement but it doesn't retrieve any record which is not equal to the selected date.
CODE:
Command = New SqlCommand("SELECT * FROM [Products] WHERE [ParkingStartDate] <> #StartDate", myConn)
Command.Parameters.AddWithValue("#StartDate", StartDate1)
This won't return anything if either of the following is true:
StartDate1 is a NULL
ParkingStartDate for all values is a NULL or equal to StartDate1 (obvious one)
Check that you are passing a non-NULL value in StartDate1 and there are records satisfying your condition.
If the values are null you would have to do
Command = New SqlCommand("SELECT * FROM [Products] WHERE [ParkingStartDate] <> #StartDate OR ParkingStartDate is null", myConn)
Command.Parameters.AddWithValue("#StartDate", StartDate1)
First stop using that <> operator.
Use instead != (NOT EQUAL)
run this statement in sql. it will return zero results. to illustrate my point.
select '1' where NULL <> 0
instead use
where columname != #startdate or columnname is null
One important thing to take into consideration when dealing with querying based on date is that the date in SQL Server is treated as exact as the date you send in. So, if you pass in a full date/time, like 2011-10-24 14:35:29, it will return all dates that are not that exact date. If you are looking for a particular portion of that date to be selected against, you need to only give that portion of the date. Using the DATEPART command will help here also.
If the value is undefined, it is not included in <> or != clause.
Along with these you can use sql function 'COALESCE()' to include rows having undefined cells.
"SELECT * FROM [Products] WHERE COALESCE([ParkingStartDate],'') <> #StartDate OR ParkingStartDate is null"
Hope it will help you.
My recommendation would be to try with NULLIF operator. Modify your query to be like :
SELECT * FROM [Products] WHERE NULLIF([ParkingStartDate], #StartDate) IS NOT NULL OR ParkingStartDate is NULL
Hope this helps.