Oracle Useful Queries for Report Development

How to check comments for columns in table/View in Oracle


 It's important to maintain column meta data so that Business Analyst can understand source of column and business meaning.
To get metadata for columns. 


select * from all_tab_columns where table_name='ViewName'


To check comments for columns:
select  * from ALL_COL_COMMENTS a where A.TABLE_NAME = 'ViewName' 

 Validate each column have comments.

 The step is simple but important in migration of table/views.


To get date of Last month for comparison


SELECT
 TRUNC(LAST_DAY(ADD_MONTHS(SYSDATE, -1))) AS LAST_DAY_LAST_MONTH FROM DUAL;  

Use in where clause:

  TRUNC (A.CALENDAR_DT) <  TRUNC(LAST_DAY(ADD_MONTHS(SYSDATE, -1)))


To create timestamp

select
'ora.EDW_DT' as txt,
to_timestamp('10-Sep-02 1:10:10.123000') as DW_UPDT_TS
from
ora.D_DT




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