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可能重複:
MySQL SELECT results from 1 table, but exclude results depending on another table?從另一個SELECT *中排除一個表中的結果?
我希望我不要求什麼已經answered..didn't看到一個。似乎很簡單,但我無法讓它工作。
我有兩個表:單位和租賃。
我想要列出所有打開的單位(建築物和單位unitnumber)的一切,從單位表中排除租賃表中的那些在enddate字段中爲空的單位。
結構表(我刪除沒有必要在這個例子中其他領域:
CREATE TABLE Unit(
UnitKey Int NOT NULL AUTO_INCREMENT,
UnitNumber Char(5) NOT NULL,
BuildingKey Int NOT NULL,
CONSTRAINT UNIT_PK PRIMARY KEY(UnitKey),
CONSTRAINT UNIT_BLDG_FK FOREIGN KEY(BuildingKey)
REFERENCES Building(BuildingKey));
CREATE TABLE Lease(
LeaseKey Int NOT NULL AUTO_INCREMENT,
UnitKey Int NOT NULL,
EndDate Date NULL,
CONSTRAINT LEASE_PK PRIMARY KEY(LeaseKey),
CONSTRAINT LEASE_UNIT_FK FOREIGN KEY(UnitKey) REFERENCES Unit(UnitKey));
類似於:http://stackoverflow.com/questions/4186242/sql-select-all-unique-values-in-table-a-which-are-not-in-table- b和http://stackoverflow.com/questions/4660871/mysql-se lect-all-items-from-table-a-if-not-exist-in-table -b – Charx 2012-08-15 17:37:23
你的問題已經被回答了很多次:http://stackoverflow.com/questions/2862778/mysql-select-results -from-1-table-but-exclude-results-depends-on-another-tabl?rq = 1 http://stackoverflow.com/questions/7596073/select-from-one-table-where-not-in-另一個?rq = 1 http://stackoverflow.com/questions/10255266/select-users-from-one-table-only-if-not-in-another?rq=1 – Jocelyn 2012-08-15 17:41:46