sql server - t sql call function as while parameter -


is possible in t sql use function while parameter? have following code:

    create function loginexists (@p_login char(6)) returns varchar(5) begin     if exists(select * student student.slogin = @p_login)         return 'true'         return 'false' end;

and

    create procedure addstudent2 (@p_fname varchar(30), @p_lname varchar(50), @p_tallness int) declare @p_login char(6), @p_email varchar(50), @suffix char(3); set @p_lname = lower(@p_lname); set @suffix = '000'; begin     set @p_login = substring(@p_lname,1, 3) + @suffix;     while (loginexists @p_login = 'true')         set @suffix = cast((cast(@suffix int) + 1) char(3));             set @p_login = substring(@p_lname,1, 3) + @suffix;     set @p_email = @p_login + '@vsb.cz';     insert student values (@p_login, @p_fname, @p_lname, @p_email, @p_tallness); end;

and when trying compile it, error occurs, saying: "incorrect syntax near '@p_login'."

your syntax calling function in fact incorrect:

replace:

while (loginexists @p_login = 'true')

with:

while (dbo.loginexists (@p_login)= 'true')

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