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select '1--0001' as c_id into #t

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select * from #t where c_id like '1--%'

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ALTER TABLE #t WITH NOCHECK ADD
CONSTRAINT [PK_temp] PRIMARY KEY CLUSTERED
(
[c_id]
) WITH FILLFACTOR = 90 ON [PRIMARY]

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select * from #t where c_id like '1--%'

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insert #t select '11--%'

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select * from #t where c_id like '11--%'

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