sql server - Trigger with specific value? -

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i've read questions/answers here on stack couldn't find need.
let's have following table:

col0  col1  col2  col3  col4 ----  ----  ----  ----  ---- 8     1         b     c 8     2         b     c 8     3         b     c 9     1         b     c 9     2         b     c

and software does:

insert testtable ([col0],[col1],[col2],[col3],[col4])    values ('8','4','a','b','c')

how can create trigger pseudo-code:

on insert when col1 = '4'   delete existing rows col0 same (8 in case)    ** except new row i've added **

it sounds more appropriate perform in instead of trigger. if goal assume: when new row inserted col0 = 8, want delete other rows same key, yes?

create trigger dbo.testtable_instead_insert on dbo.testtable instead of insert begin   set nocount on;    delete t      dbo.testtable t     inner join inserted     on t.col0 = i.col0     i.col1 = '4';    insert dbo.testtable(col0,col1,col2,col3,col4)     select col0,col1,col2,col3,col4       inserted; end go

the question rule want follow if insert attempts add multiple rows same col0 value? imagine insert statement is:

insert dbo.testtable ([col0],[col1],[col2],[col3],[col4])  select '8','4','a','b','c' union  select '8','3','c','d','e';

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