I'm starting to study MySQL and I found in one of my resources the use of the command: Alter table tableName modify(....) Instead of using 'modify column' It it valid to use it and if it's I want some. I…
According to tests both SQL give the same result. alter table public.company add constraint company_name_key unique ("name") vs. alter table public.company add unique ("name"); PostgreSQL (ver. 12.16)
I need to alter the Data Type of a named column (let's call them 'photo') across all the tables in a schema. For example: I have 300 tables with identical structure (except the data in each row of course). But…
I am implementing data partitioning on mysql server(8.0). As a "must-have requirement of partitioning" I have to add my partition key as a primary key, which is created_at in my table. eg: alter table notifications drop primary key, add primary…
I am trying to add a column and a new constraint to a simple table in Postgres. It's balking on the keyword UNIQUE. I've gone back and forth between my sliver of code and the documentation for ALTER TABLE, but…
I altered a table using the command ALTER TABLE sys.system_property ADD COLUMN IF NOT EXISTS description text; COMMENT ON COLUMN sys.system_property.description IS 'description of property'; I then need to have a default value and set it no Not NULL so…
I would to know if it is possible to avoid adding several times the same foreign key constraint? Example: if I execute 3 times the query below, the constraint will exist with 3 times in phpmyadmin... It would be great…