各位前輩: 一個ｔａｂｌｅ1對一個ｔａｂｌｅ2ㄉ關連是這樣寫 SELECT * FROM ｔａｂｌｅ1 inner join ｔａｂｌｅ2 on ｔａｂｌｅ1.欄位 = ｔａｂｌｅ2.欄位 WHERE 1 = 1 我想要有4個table做關連請問該怎麼寫 謝謝 逃避不一定躲得過 面對不一定最難受 孤單不一定不快樂 得到不一定能長久 失去不一定不再有 轉身不一定最軟弱

給你一個4個以上的sql SELECT CONCAT(p1.id, p1.tvab) 0 AS tvid, CONCAT(p1.christian_name, " ", p1.surname) AS Name, p1.postal_code AS Code, p1.city AS City, pg.abrev AS Area, IF(td.participation = "Aborted", "A", " ") AS A, p1.dead AS dead1, l.event AS event1, td.suspect AS tsuspect1, id.suspect AS isuspect1, td.severe AS tsevere1, id.severe AS isevere1, p2.dead AS dead2, l2.event AS event2, h2.nurse AS nurse2, h2.doctor AS doctor2, td2.suspect AS tsuspect2, id2.suspect AS isuspect2, td2.severe AS tsevere2, id2.severe AS isevere2, l.finish_date FROM twin_project AS tp /* For Twin 1 */ LEFT JOIN twin_data AS td ON tp.id = td.id AND tp.tvab = td.tvab LEFT JOIN informant_data AS id ON tp.id = id.id AND tp.tvab = id.tvab LEFT JOIN harmony AS h ON tp.id = h.id AND tp.tvab = h.tvab LEFT JOIN lentus AS l ON tp.id = l.id AND tp.tvab = l.tvab /* For Twin 2 */ LEFT JOIN twin_data AS td2 ON p2.id = td2.id AND p2.tvab = td2.tvab LEFT JOIN informant_data AS id2 ON p2.id = id2.id AND p2.tvab = id2.tvab LEFT JOIN harmony AS h2 ON p2.id = h2.id AND p2.tvab = h2.tvab LEFT JOIN lentus AS l2 ON p2.id = l2.id AND p2.tvab = l2.tvab, person_data AS p1, person_data AS p2, postal_groups AS pg WHERE /* p1 gets main twin and p2 gets his/her twin. */ /* ptvab is a field inverted from tvab */ p1.id = tp.id AND p1.tvab = tp.tvab AND p2.id = p1.id AND p2.ptvab = p1.tvab AND /* Just the sceening survey */ tp.survey_no = 5 AND /* Skip if partner died before 65 but allow emigration (dead=9) */ (p2.dead = 0 OR p2.dead = 9 OR (p2.dead = 1 AND (p2.death_date = 0 OR (((TO_DAYS(p2.death_date) - TO_DAYS(p2.birthday)) / 365) >= 65)))) AND ( /* Twin is suspect */ (td.future_contact = 'Yes' AND td.suspect = 2) OR /* Twin is suspect - Informant is Blessed */ (td.future_contact = 'Yes' AND td.suspect = 1 AND id.suspect = 1) OR /* No twin - Informant is Blessed */ (ISNULL(td.suspect) AND id.suspect = 1 AND id.future_contact = 'Yes') OR /* Twin broken off - Informant is Blessed */ (td.participation = 'Aborted' AND id.suspect = 1 AND id.future_contact = 'Yes') OR /* Twin broken off - No inform - Have partner */ (td.participation = 'Aborted' AND ISNULL(id.suspect) AND p2.dead = 0)) AND l.event = 'Finished' /* Get at area code */ AND SUBSTRING(p1.postal_code, 1, 2) = pg.code /* Not already distributed */ AND (h.nurse IS NULL OR h.nurse=00 OR h.doctor=00) /* Has not refused or been aborted */ AND NOT (h.status = 'Refused' OR h.status = 'Aborted' OR h.status = 'Died' OR h.status = 'Other') ORDER BY tvid;

引言: 給你一個4個以上的sql SELECT CONCAT(p1.id, p1.tvab) 0 AS tvid, CONCAT(p1.christian_name, " ", p1.surname) AS Name, p1.postal_code AS Code, p1.city AS City, pg.abrev AS Area, IF(td.participation = "Aborted", "A", " ") AS A, p1.dead AS dead1, l.event AS event1, td.suspect AS tsuspect1, id.suspect AS isuspect1, td.severe AS tsevere1, id.severe AS isevere1, p2.dead AS dead2, l2.event AS event2, h2.nurse AS nurse2, h2.doctor AS doctor2, td2.suspect AS tsuspect2, id2.suspect AS isuspect2, td2.severe AS tsevere2, id2.severe AS isevere2, l.finish_date FROM twin_project AS tp /* For Twin 1 */ LEFT JOIN twin_data AS td ON tp.id = td.id AND tp.tvab = td.tvab LEFT JOIN informant_data AS id ON tp.id = id.id AND tp.tvab = id.tvab LEFT JOIN harmony AS h ON tp.id = h.id AND tp.tvab = h.tvab LEFT JOIN lentus AS l ON tp.id = l.id AND tp.tvab = l.tvab /* For Twin 2 */ LEFT JOIN twin_data AS td2 ON p2.id = td2.id AND p2.tvab = td2.tvab LEFT JOIN informant_data AS id2 ON p2.id = id2.id AND p2.tvab = id2.tvab LEFT JOIN harmony AS h2 ON p2.id = h2.id AND p2.tvab = h2.tvab LEFT JOIN lentus AS l2 ON p2.id = l2.id AND p2.tvab = l2.tvab, person_data AS p1, person_data AS p2, postal_groups AS pg WHERE /* p1 gets main twin and p2 gets his/her twin. */ /* ptvab is a field inverted from tvab */ p1.id = tp.id AND p1.tvab = tp.tvab AND p2.id = p1.id AND p2.ptvab = p1.tvab AND /* Just the sceening survey */ tp.survey_no = 5 AND /* Skip if partner died before 65 but allow emigration (dead=9) */ (p2.dead = 0 OR p2.dead = 9 OR (p2.dead = 1 AND (p2.death_date = 0 OR (((TO_DAYS(p2.death_date) - TO_DAYS(p2.birthday)) / 365) >= 65)))) AND ( /* Twin is suspect */ (td.future_contact = 'Yes' AND td.suspect = 2) OR /* Twin is suspect - Informant is Blessed */ (td.future_contact = 'Yes' AND td.suspect = 1 AND id.suspect = 1) OR /* No twin - Informant is Blessed */ (ISNULL(td.suspect) AND id.suspect = 1 AND id.future_contact = 'Yes') OR /* Twin broken off - Informant is Blessed */ (td.participation = 'Aborted' AND id.suspect = 1 AND id.future_contact = 'Yes') OR /* Twin broken off - No inform - Have partner */ (td.participation = 'Aborted' AND ISNULL(id.suspect) AND p2.dead = 0)) AND l.event = 'Finished' /* Get at area code */ AND SUBSTRING(p1.postal_code, 1, 2) = pg.code /* Not already distributed */ AND (h.nurse IS NULL OR h.nurse=00 OR h.doctor=00) /* Has not refused or been aborted */ AND NOT (h.status = 'Refused' OR h.status = 'Aborted' OR h.status = 'Died' OR h.status = 'Other') ORDER BY tvid;

我想用inner join可以ㄇ??? 逃避不一定躲得過 面對不一定最難受 孤單不一定不快樂 得到不一定能長久 失去不一定不再有 轉身不一定最軟弱

inner join 的話, 用法完全一樣. 如下:    

SELECT * FROM TABLE1 T1
INNER JOIN TABLE2 T2 ON T1.COLUMN1 = T2.COLUMN1
INNER JOIN TABLE3 T3 ON T1.COLUMN1 = T3.COLUMN1 AND T3.COLUMN3='S' --AND 後的為一種例子. 可依你的實際狀況來修改 亦可用 OR 或其他 CONDITION
INNER JOIN TABLE4 T4 ON T1.COLUMN1 = T4.COLUMN1
WHERE 1 = 1 

其中 INNER JOIN TABLE 後的對應條件式可依你的實際狀況來調整

引言: inner join 的話, 用法完全一樣. 如下:

SELECT * FROM TABLE1 T1
INNER JOIN TABLE2 T2 ON T1.COLUMN1 = T2.COLUMN1
INNER JOIN TABLE3 T3 ON T1.COLUMN1 = T3.COLUMN1 AND T3.COLUMN3='S' --AND 後的為一種例子. 可依你的實際狀況來修改 亦可用 OR 或其他 CONDITION
INNER JOIN TABLE4 T4 ON T1.COLUMN1 = T4.COLUMN1
WHERE 1 = 1 

其中 INNER JOIN TABLE 後的對應條件式可依你的實際狀況來調整

這樣寫是對~~但可以善用 left join 和 right join 這樣會更完美～～～謝謝你^o^ 逃避不一定躲得過 面對不一定最難受 孤單不一定不快樂 得到不一定能長久 失去不一定不再有 轉身不一定最軟弱