Question

I have the following SQL I trigger in a C# app.

All works well but the ID table doesn’t auto increment. It creates the value of 1 for the first entry then will not allow other inserts due to not being able to create a unquie ID.

Here is the SQL:

CREATE TABLE of_mapplist_raw (
    id          integer PRIMARY KEY NOT NULL,
    form_name   varchar(200) NOT NULL,
    form_revi   varchar(200) NOT NULL,
    source_map  varchar(200),
    page_num    varchar(200) NOT NULL,
    fid         varchar(200) NOT NULL,
    fdesc       varchar(200) NOT NULL
)";

I’m sure its a schoolboy error at play here.

Answer 1

you need to specify its seed and increment.( plus , i dont think there is integer keyword ….)

id  [int] IDENTITY(1,1) NOT NULL,

the first value is the seed

the second one is the delta between increases

A Question you might ask :

delta between increases ? why do i need that ? its always 1 ….??

well – yes and no. sometimes you want to leave a gap between rows – so you can later insert rows between… specially if its clustered index by that key….and speed is important… so you can pre-design it to leave gaps.

p.s. ill be glad to hear other scenarios from watchers.