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ALTER TABLE users ALTER COLUMN email VARCHAR(50) UNIQUE NOT NULL;
ERROR:  syntax error at or near "VARCHAR"
LINE 1: ALTER TABLE users ALTER COLUMN email VARCHAR(50) UNIQUE NOT ...

I want to alter column email to add its type as UNIQUE NOT NULL in Postgresql and get this error. Can you explain to me what's wrong?

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    I believe it is varying(50) not` varchar(50)`. Commented Mar 4, 2020 at 18:16
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    @Dan: no, varchar(50) is fine Commented Mar 4, 2020 at 18:38

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You cannot create 2 constraints with one single statement. And you have to use PostgreSQL syntax.

alter table users alter column email set not null;
alter table users add constraint email_unique unique (email);
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