6 апр. 2018 г. · In Redshift, a primary key MAY be useful if you need it for queries, for example referring to the primary key when joining to another table.

1 июн. 2016 г. · Here's one way to get a table's primary key: SELECT schemaname, tablename, replace(substr(ddl, POSITION('(' IN ddl)+1 ),')','') primary_key FROM admin.v_ ...

29 мар. 2019 г. · I would like to alter table in Amazon Redshift, and put two columns as a composite Primary key. I tried this code snippet: ALTER TABLE tableNameHere ADD ...

20 июн. 2022 г. · Nonetheless, primary keys and foreign keys are used as planning hints and they should be declared if your ETL process or some other process in ...

9 мая 2014 г. · I have a table for which I want to define a composite primary key with two columns in redshift. I am having some trouble with create table syntax.

18 сент. 2017 г. · I am trying to replicate a table using CTAS clause in redshift by additionally specifying a primary key to the table. Tried below syntax but no luck.

10 сент. 2021 г. · Yes, both statements are correct - Redshift does not enforce uniqueness and identifying primary / foreign keys can speed up queries.

2 мар. 2013 г. · If your application allows invalid foreign keys or primary keys, some queries could return incorrect results. For example, a SELECT DISTINCT ...

10 нояб. 2021 г. · Tables created with the LIKE option don't inherit primary and foreign key constraints. Distribution style, sort keys, BACKUP, and NULL properties are inherited ...

10 апр. 2019 г. · If two columns are a primary key, then they are unique. Are you saying that you have two columns that you want to be unique but are not? – ...