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?Oracle???????????????????????????Null???Nulls?????????????Null?????????????????????????????????Null???????????????????????
Oracle?????Nulls?????NULLS FIRST?NULLS LAST?????????????Null?????NULLS FIRST??Null??????????NULLS LAST???Null?????????
???????NULLS FIRST??????
SELECT * FROM zl_cbqc ORDER BY cb_ld NULLS FIRST;
???????cb_ld??????????cb_ld????Null????Null????????????????cb_ld???????
1Null3?????????????
????Null?????????????NULLS LAST?????????
SELECT * FROM zl_cbqc ORDER BY cb_ld NULLS LAST;
??????????????????
????????Nulls??????????WITH???????????????????WITH????????
WITH tab AS ( SELECT 1 id, 'Name1' name, 'Dept1' dept FROM dual UNION ALL SELECT 2 id, 'Name2' name, 'Dept2' dept FROM dual UNION ALL SELECT 3 id, 'Name3' name, 'Dept3' dept FROM dual UNION ALL SELECT 4 id, 'Name4' name, 'Dept4' dept FROM dual)SELECT id, name, dept FROM tab ORDER BY dept, id NULLS LAST;
???????dept?id??????????NULLS LAST???dept???????id???????????????dept????Null????????????????
???????Null???????????????????????????????NULLS FIRST???????????????????????????????????Null????????NULLS LAST??????
Oracle?NULLS FIRST?NULLS LAST????????????????????????????????Null???????????????????????
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