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.
Related
Due to some activity in my project I want to run this query in some frequency and check "where my query can fetch table timestamp is <= 1 min from current timestamp"
SQL Query to check the updated data in the table.
Even though your question is incomplete, you haven't provided your existing table structure or any queries. I'm just giving you some generic solution here which should work as long as you can convert that based on your specific need.
so, you are trying to get the difference of two-time values in minutes
Time that record was saved
Current Time
If you have a table : LogRecords with below fields:
LogId
LogMessage
LogTimestamp
then you would write your query to pull last-minute logs as :
select * from LogRecords
where DATEDIFF(MINUTE, LogTimestamp , GETDATE()) <= 1
I haven't tested this code but it should be 99% similar if it won't work. Please try and let me know.
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.
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)
HI all,
i have one sql table and field for that table is
id
name
expireydate
Now i want only those record which one is expired within 45 days or 30 days.
how can i do with sql query .?
I have not much more exp with sql .
Thanks in advance,
If you are using mysql then try DATEDIFF.
for 45 days
select * from `table` where DATEDIFF(now(),expireydate)<=45;
for 30 days
select * from `table` where DATEDIFF(now(),expireydate)<=30;
In oracle - will do the trick instead of datediff and SYSDATE instead of now().[not sure]
In sql server DateDiff is quite different you have to provide unit in which difference to be taken out from 2 dates.
DATEDIFF(datepart,startdate,enddate)
to get current date try one of this: CURRENT_TIMESTAMP or GETDATE() or {fn NOW()}
You can use a simple SELECT * FROM yourtable WHERE expireydate < "some formula calculating today+30 or 45 days".
Simple comparison will work there, the tricky part is to write this last bit concerning the date you want to compare to. It'll depend of your environment and how you stored the "expireydate" in the database.
Try Below:-
SELECT * FROM MYTABLE WHERE (expireydate in days) < ((CURRENTDATE in days)+ 45)
Do not execute directly! Depending of your database, way of obtaining a date in days will be different. Go look at your database manual or please precise what is your database.
How would I go about doing a query that returns results of all rows that contain dates for current year and month at the time of query.
Timestamps for each row are formated as such: yyyy-mm-dd
I know it probably has something to do with the date function and that I must somehow set a special parameter to make it spit out like such: yyyy-mm-%%.
Setting days to be wild card character would do the trick but I can't seem to figure it out how to do it.
Here is a link to for quick reference to date-time functions in mysql:
http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html
Thanks
I think EXTRACT is the function you are looking for:
SELECT * FROM table
WHERE EXTRACT(YEAR_MONTH FROM timestamp_field) = EXTRACT(YEAR_MONTH FROM NOW())
you could extract the year and month using a function, but that will not be able to use an index.
if you want scalable performance, you need to do this:
SELECT *
FROM myTable
WHERE some_date_column BETWEEN '2009-01-01' AND '2009-01-31'
select * from someTable where year(myDt) = 2009 and month(myDt) = 9 and day(myDt) = 12