Sql 从交易中选择名称、截止日期（transactiondate，'J'）作为txn\U日期； transaction table ID Name transactiondate 1 AAA 2458010 2 BBB

从交易中选择名称、截止日期（transactiondate，'J'）作为txn\U日期；

transaction table 
ID   Name   transactiondate    
1    AAA    2458010   
2    BBB    2458351
3    CCC    2458712

Select * from transaction where transactiondate <= TOCHAR(todate('2019/09/17 00:00:00', 'YYYY/MM/DD hh24:mi:ss') , 'J');
ID   Name   transactiondate    
1    AAA    2458010   
2    BBB    2458351

Select name, convert(datetime, convert(varchar(10), transactiondate)) as txndateformat 
from transaction;

Desc transaction;
Name             Null?     Type
Id               Not Null  Number(19)
Name             Not Null  VarChar2(100)
transactiondate  Not Null  Number(22)

NAME | JULIAN_DATE | UNIX_TIMESTAMP | SECONDS_SINCE_1970 | MINUTES_SINCE_1970 | HOURS_SINCE_1970 | HOURS_SINCE_1900 | EXCEL_DATE :--- | :------------------ | :------------------ | :------------------ | :------------------ | :------------------ | :------------------ | :------------------ AAA | 2014-02-13 00:00:00 | 1970-01-01 00:40:56 | 1970-01-29 10:25:02 | 1974-09-03 01:02:00 | 2250-04-05 14:00:00 | 2180-04-04 14:00:00 | 8626-03-21 00:00:00 BBB | 2014-02-14 00:00:00 | 1970-01-01 00:40:56 | 1970-01-29 10:25:03 | 1974-09-03 01:03:00 | 2250-04-05 15:00:00 | 2180-04-04 15:00:00 | 8626-03-22 00:00:00

SELECT DATEADD(ss, 2456702, '19700101') --ss means interval = seconds

select to_date('19700101', 'YYYYMMDD') + ( 1 / 24 / 60 / 60) * 2456702
from dual;