Answers for "postgresql change column constraint"

SQL
31

postgresql add column with constraint

ALTER TABLE customers 
ADD COLUMN contact_name VARCHAR NOT NULL;
Posted by: Guest on February-18-2020
2

postgres alter table add primary key

-- To set a column as primary key:
ALTER TABLE distributors ADD PRIMARY KEY (tablename);
Posted by: Guest on November-02-2020
0

alter constraint postgres

/* Drop your constraint */
alter table yourtable drop constraint constraint_name;

/* Create new constraint */
alter table yourtable add constraint "constraint_name" FOREIGN KEY (some_id) REFERENCES yourtable(some_id) on delete cascade;
Posted by: Guest on February-02-2021

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