我如何从另一个表中选择

Question

Basically I want to run a SQL statement like this, but I can't due to errors. Not sure why?

INSERT INTO allevent (eventname) 
VALUES (select username from registered)

Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword 'select'.

Msg 102, Level 15, State 1, Line 1
Incorrect syntax near ')'.

Answer 1

No need of parentheses around the SELECT statement in your query.

 INSERT INTO allevent (eventname) 
 SELECT username FROM registered

Parentheses with VALUES required, where some places like below:

INSERT INTO tablename (fieldname) 
VALUES ('field 01'), ('field 02');

Please find the syntax for the INSERT statement.