I have a column of dates in my table (referred as org_day).
I try to add a new column that represent the day after, that is
day_after = org_day + day (or 24 hours) (for all rows of org_day)
From what I've read, the DATE_ADD function of SQL does not
work on the entire column, so trying to do something like:
DATE_ADD (org_day, INTERVAL 24 HOUR) or
DATE_ADD (DATE org_day, INTERVAL 24 HOUR)
do not work.
The usual examples that do work look like:
DATE_ADD (DATE '2019-12-22', INTERVAL 1 day),
But I want to perform this operation on the entire column,
not on a constant date.
Appreciate any help.
To update the entire column, you need to set everything on that column. Try this, hope it solved ur problem...
UPDATE table_name SET column_name = DATE_ADD(var, interval);
You can try this:
CREATE OR REPLACE TABLE
mydataset.mytable AS
SELECT
org_day,
DATE_ADD(org_day, INTERVAL 1 day) day_after
FROM
mydataset.mytable;
This above statement will modify the the existing table by adding a new column, without deleting exiting data.
I would suggest using a view:
create view v_t as
select t.*, date_add(org_day, interval 1 day) as day_after
from t;
If you always want the new column to be in synch with existing column, then a view ensures that the data is consistent. The value is calculated when you query the data.
Related
I have a simple table, which is queried from my backend every minute.
id (int) | phone_number (string) | start (timedatestamp) | period (string) | occurances (int)
I make an sql query, which runs every minute, and returns the results. It's selects all phone_numbers which start this minute.
SELECT * FROM table
WHERE start >= date_trunc('minute', now()) and
start < date_trunc('minute', now()) + interval '1 minute'
as results
This runs fine, but I need to update the table as well, based on this select results.
There are two parts to this:
For each selected row, I need the occurrences to decrement by 1 and update the database with this
For each selected row, if the periodicity='MONTHLY", I need the start column to change to the date and time exactly a month from now.
Is it possible to do this in one SQL statement? Any help or examples are greatly appreciated :)
Yes and you can do so directly. The only 'twist' is when a column in mentioned in the SET clause Postgres always writes the Rvalue. When you desire to conditionally update a column you set the Rvalue to the existing value when the condition is not meet. See fiddle here.
update atable
set occurances = occurances-1
, start_tm = case when period_txt = 'Monthly'
then now()+interval '1 month'
else start_tm
end
where date_trunc('minute',start_tm) = date_trunc('minute',now());
I'm novice to SQL (in hive) and trying to calculate every anonymousid's time spent between first event and last event in minutes. The resource table's timestamp is formatted as string,
like: "2020-12-24T09:47:17.775Z". I've tried in two ways:
1- Cast column timestamp to bigint and calculated the difference from main table.
select anonymousid, max(from_unixtime(cast('timestamp' as bigint)) - min(from_unixtime(cast('timestamp' as bigint)) from db1.formevent group by anonymousid
I got NULLs after implementing this as a solution.
2- Create a new table from main resource, put conditions to call with 'where' and tried to convert 'timestamp' to date format without any min-max calculation.
create table db1.successtime as select anonymousid, pagepath,buttontype, itemname, 'location', cast(to_date(from_unixtime(unix_timestamp('timestamp', "yyyy-MM-dd'T'HH:mm:ss.SSS"),'HH:mm:ss') as date) from db1.formevent where pagepath = "/account/sign-up/" and itemname = "Success" and 'location' = "Standard"
Then I got NULLs again and I left. It looks like this
Is there any way I can reformat and calculate time difference in minutes between first and last event ('timestamp') and take the average grouped by 'location'?
select anonymousid,
(max(unix_timestamp(timestamp, "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")) -
min(unix_timestamp(timestamp, "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"))
) / 60
from db1.formevent
group by anonymousid;
From your description, this should work:
select anonymousid,
(max(unix_timestamp(timestamp, 'yyyy-MM-dd'T'HH:mm:ss.SSS'),'HH:mm:ss') -
min(unix_timestamp(timestamp, 'yyyy-MM-dd'T'HH:mm:ss.SSS'),'HH:mm:ss')
) / 60
from db1.formevent
group by anonymousid;
Note that the column name is not in single quotes.
I have a column (ROW_UPDATE_TIME) in a table where it stores the timestamp when an update happens in this table.
I'd like to know how to check rows that the timestamp is today.
This is what I'm using now, but it's not a pretty solution I think:
SELECT
*
FROM
TABLE
WHERE
ROW_UPDATE_TIME BETWEEN (CURRENT TIMESTAMP - 1 DAY) AND (CURRENT TIMESTAMP + 1 DAY);
Is there a better solution, example: ROW_UPDATE_TIME = CURRENT DATE, or something like that?
Found it:
SELECT
*
FROM
TABLE
WHERE
DATE(ROW_UPDATE_TIME) = CURRENT DATE;
The first version you have provided will not return you the results you expect, because you will get in the result timestamps from today or tomorrow, depends on the hour you run it.
Use the query below to get the results from today:
SELECT
*
FROM
table
WHERE
row_update_time
BETWEEN TIMESTAMP(CURRENT_DATE,'00:00:00')
AND TIMESTAMP(CURRENT_DATE,'23:59:59')
Avoid applying a function to a column you compare in the where clause(DATE(row_update_time) = CURRENT_DATE) . That will cause the optimizer to run the function against each row, just to allocate the data you need. It could slow down the query dramatically. Try to run explain against the two versions and you will see what I mean.
Trying to use the statement:
SELECT *
FROM data.example
WHERE TIMESTAMP(timeCollected) < DATE_ADD(USEC_TO_TIMESTAMP(NOW()), 60, 'MINUTE')
to get data from my bigquery data. It seems to return same set of result even when time is not within the range. timeCollected is of the format 2015-10-29 16:05:06.
I'm trying to build a query that is meant to return is data that is not older than an hour. So data collected within the last hour should be returned, the rest should be ignored.
Using Standard SQL:
SELECT * FROM data
WHERE timestamp > TIMESTAMP_ADD(CURRENT_TIMESTAMP(), INTERVAL -60 MINUTE)
The query you made means "return to me anything that has a collection time smaller than an hour in the future" which will literally mean your whole table. You want the following (from what I got through your comment, at least) :
SELECT *
FROM data.example
WHERE TIMESTAMP(timeCollected) > DATE_ADD(USEC_TO_TIMESTAMP(NOW()), -60, 'MINUTE')
This means that any timeCollected that is NOT greater than an hour ago will not be returned. I believe this is what you want.
Also, unless you need it, Select * is not ideal in BigQuery. Since the data is saved by column, you can save money by selecting only what you need down the line. I don't know your use case, so * may be warranted though
To get table data collected within the last hour:
SELECT * FROM [data.example#-3600000--1]
https://cloud.google.com/bigquery/table-decorators
Using Standard SQL:
SELECT * FROM data WHERE timestamp > **TIMESTAMP_SUB**(CURRENT_TIMESTAMP(), INTERVAL 60 MINUTE)
I was just wondering how would I go about checking to see if, for example, a booking is due within 24 hours?
My bookings table will have the important fields that may help in finding the solution: studiono, title, date, time, hour
At the moment, I have tried the following:
select StudioNo
from Bookings
where sysdate - "DATE" <1
and "TIME" - trunc("Time") + trunc(systimestamp) > systimestamp;
However, I don't think this works. Am I doing this correctly?
Any help is appreciated.
Without knowing what your database structure is:
select StudioNo
from Bookings
where to_date(date || time, 'dd-mon-yyyyhh24:mi:ss') < sysdate +1
and to_date(date || time, 'dd-mon-yyyyhh24:mi:ss') > sysdate
basically, create a single date/time field from your 2 seperate date and time columns (which I'm assuming here are strings), and then compare that to sysdate + 1
Firstly, is there any particular reason why your Bookings table has separate columns for date and time? The Oracle datatype DATE will include both of these in a single column. This will then make the required query much more straight forward:
SELECT StudioNo
FROM Bookings
WHERE BookingDate BETWEEN SYSDATE AND SYSDATE+1;