IF COL_LENGTH('dbo.asr_row_lastno', 'current_crn_no') IS NULL
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BEGIN
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ALTER TABLE [dbo].[asr_row_lastno]
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ADD [current_crn_no] INT NULL;
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EXEC sys.sp_addextendedproperty
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@name = N'MS_Description', @value = N'当前堆垛机号',
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@level0type = N'SCHEMA', @level0name = N'dbo',
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@level1type = N'TABLE', @level1name = N'asr_row_lastno',
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@level2type = N'COLUMN', @level2name = N'current_crn_no';
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END;
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