0
我很確定它與我的選擇表或連接順序有關,但在查詢中嘗試了各種重新排序,我仍然堅持使用0結果。MySQL JOINs - 沒有結果
難道有人指着我正確的方向嗎?
圖表A(返回355次的結果):
SELECT DISTINCT
person.person_id as "Person ID",
CONCAT(person.last, ', ', person.first) as "Patient Name",
person.birthday as "Birthday",
person_ins_tie.insurance_id as "Insurance ID",
insurance.carrier as "Carrier",
insurance.phone as "Carrier Phone Number"
FROM
person
JOIN
person_ins_tie ON person.person_id = person_ins_tie.person_id
JOIN
insurance ON person_ins_tie.insurance_id = insurance.insurance_id
WHERE
insurance.carrier LIKE 'Blue%'
圖表B(返回0的結果/沒有錯誤):
SELECT DISTINCT
person.person_id as 'Person ID',
patient.display_id as 'Chart #',
CONCAT(person.last, ', ', person.first) as 'Patient Name',
person.birthday as 'Birthday',
insurance.insurance_id as 'Insurance ID',
insurance.carrier as 'Carrier',
insurance.phone as 'Carrier Phone Number'
FROM
person
JOIN
person_ins_tie ON person.person_id = person_ins_tie.person_id
JOIN
insurance ON person_ins_tie.insurance_id = insurance.insurance_id
JOIN
patient ON person.person_id = patient.person_id
WHERE
insurance.carrier LIKE 'Blue%'
我欣賞反饋!
您是否檢查過在第一個查詢中的任何「人」在「patient」中是否存在匹配的「person_id」? – trogdor
在此基礎上,我不能說太多,但檢查所有提到的表格(尤其是耐心,因爲它是差異)中的數據是否良好,並檢查列出的列(是否存在於相應的表格中)。 –