MOCKSTACKS
EN
Questions And Answers

More Tutorials









postgreSQL Postgres Tip and Tricks

Examples

DATEADD alternative in Postgres


SELECT CURRENT_DATE + '1 day'::INTERVALSELECT '1999-12-11'::TIMESTAMP + '19 days'::INTERVALSELECT '1 month'::INTERVAL + '1 month 3 days'::INTERVAL

Comma seperated values of a column


SELECT
 string_agg(<TABLE_NAME>.<COLUMN_NAME>, ',')
FROM
 <SCHEMA_NAME>.<TABLE_NAME> T

Delete duplicate records from postgres table


DELETE
 FROM <SCHEMA_NAME>.<Table_NAME>
WHERE
 ctid NOT IN
 (
 SELECT
 MAX(ctid)
 FROM
 <SCHEMA_NAME>.<TABLE_NAME>
 GROUP BY
 <SCHEMA_NAME>.<TABLE_NAME>.*
 )
;

Update query with join between two tables alternative since Postresql does not support join in update query.


update <SCHEMA_NAME>.<TABLE_NAME_1> AS A
 SET <COLUMN_1> = True
 FROM <SCHEMA_NAME>.<TABLE_NAME_2> AS B
 WHERE
 A.<COLUMN_2> = B.<COLUMN_2> AND
 A.<COLUMN_3> = B.<COLUMN_3>



Conclusion

In this page (written and validated by ) you learned about postgreSQL Postgres Tip and Tricks . What's Next? If you are interested in completing postgreSQL tutorial, your next topic will be learning about: postgreSQL Difference between two date timestamps month wise and year wise.



Incorrect info or code snippet? We take very seriously the accuracy of the information provided on our website. We also make sure to test all snippets and examples provided for each section. If you find any incorrect information, please send us an email about the issue: mockstacks@gmail.com.


Share On:


Mockstacks was launched to help beginners learn programming languages; the site is optimized with no Ads as, Ads might slow down the performance. We also don't track any personal information; we also don't collect any kind of data unless the user provided us a corrected information. Almost all examples have been tested. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. By using Mockstacks.com, you agree to have read and accepted our terms of use, cookies and privacy policy.