1.使用二分法查询，提高查询内表数据速度
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Read table int_fligh with key airln = ‘LF’.
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Read table int_fligh with key airln = ‘LF’ binary search.
2.两个内表添加使用批量增加代替逐行
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Loop at int_fligh1.
Append int_fligh1 to int_fligh2.
Endloop.
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Append lines of int_fligh1 to int_fligh2.
3.使用FOR ALL Entries
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Loop at int_cntry. Select single * from zfligh into int_fligh where cntry = int_cntry-cntry. Append int_fligh. Endloop.
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Select * from zfligh appending table int_fligh
For all entries in int_cntry
Where cntry = int_cntry-cntry.