How to get previous day date in Hive

问题

I am novice to Hive. Trying to get the previous day date using the below query:

SELECT MAX(id) FROM store_rcd_table
WHERE recon_dt = unix_timestamp(date_sub(from_unixtime(unix_timestamp(),
'yyyy-MM-dd'),1),'yyyy-MM-dd')

but getting the NULL as output. The output should have been date(2017-09-23) and MAX(id).

Also tried,

Select MAX(id) FROM store_rcd_table
WHERE recon_dt ='2017-09-24';

No output for this query also, just OK is coming as an output.

Not getting what the issue is? Any suggestion/ help is appreciated.

The structure of the table is:

id              string                                      
locationid      string                                      
mngrid          string                                      
empid           string                                                                          
deleted         boolean                                     
recon_dt        string                                      

回答1:

Try select date_sub(current_date, 1);

0: jdbc:hive2://hiveserver2:1> select date_sub(current_date, 1);
+-------------+--+
|     _c0     |
+-------------+--+
| 2017-09-24  |
+-------------+--+
1 row selected (0.182 seconds)

_{Original attempt was date_sub(CAST(unix_timestamp()*1000 AS TIMESTAMP), 1) but apparently that's wrong. See comments}

Feel free to read up on Hive Date Functions

---

If you get no results, you should check the source data to see what recon_dt actually is. (Also worth pointing out that you used two different tables in the question)

来源：https://stackoverflow.com/questions/46415615/how-to-get-previous-day-date-in-hive