我正在使用一个mysql查询，使用LEFT OUTER JOIN从多个表中选择数据。现在，当我执行查询时，我得到以下错误：
您的SQL语法有错误；查看手册与您的MySQL服务器版本相对应，以便使用正确的语法接近'wg.werkbon_global_id=wk.werkbon_klant_globalid LEFT OUTER在第16行将用户作为u'加入
只是问题是我找不出我的查询出了什么问题。
PHP查询：
$query = '
SELECT
wg.werkbon_global_id AS id,
wg.werkbon_global_status AS status,
wg.werkbon_global_date_lastedit AS date,
usr.user_firstname AS monteur_vn,
usr.user_insertion AS monteur_tv,
usr.user_lastname AS monteur_an,
wg.werkbon_global_type AS type,
wg.werkbon_global_layout AS layout,
wg.werkbon_global_werkzaamheden AS werkzaamheden,
wg.werkbon_global_opmerkingen AS opmerkingen,
wk.werkbon_klant_nummer AS klantnr
FROM
werkbon_klant AS wk
LEFT OUTER JOIN werkbon_global AS wg
wg.werkbon_global_id = wk.werkbon_klant_globalid
LEFT OUTER JOIN users AS usr
usr.user_id = wg.werkbon_global_monteur_finish
WHERE
wk.werkbon_klant_nummer = '.$db->Quote($klantid).'
ORDER BY id ASC;
$result = $db->loadAssoc($query);
我想我的问题与左外联接有关，但怎么了？
联接中缺少ON运算符！
联接的正确语法是：
SELECT * FROM x LEFT JOIN y ON condition WHERE...
$query = "
SELECT
wg.werkbon_global_id AS id,
wg.werkbon_global_status AS status,
wg.werkbon_global_date_lastedit AS date,
usr.user_firstname AS monteur_vn,
usr.user_insertion AS monteur_tv,
usr.user_lastname AS monteur_an,
wg.werkbon_global_type AS type,
wg.werkbon_global_layout AS layout,
wg.werkbon_global_werkzaamheden AS werkzaamheden,
wg.werkbon_global_opmerkingen AS opmerkingen,
wk.werkbon_klant_nummer AS klantnr
FROM
werkbon_klant AS wk
LEFT OUTER JOIN werkbon_global AS wg
wg.werkbon_global_id = wk.werkbon_klant_globalid
LEFT OUTER JOIN users AS usr
usr.user_id = wg.werkbon_global_monteur_finish
WHERE
wk.werkbon_klant_nummer = '.$db->Quote($klantid).'
ORDER BY id ASC";
$result=$db->loadAssoc（$query）；
确保没有遗漏报价
由于arkascha 解决了问题
现在固定的查询是：
$query = '
SELECT
wg.werkbon_global_id AS id,
wg.werkbon_global_status AS status,
wg.werkbon_global_date_lastedit AS date,
usr.user_firstname AS monteur_vn,
usr.user_insertion AS monteur_tv,
usr.user_lastname AS monteur_an,
wg.werkbon_global_type AS type,
wg.werkbon_global_layout AS layout,
wg.werkbon_global_werkzaamheden AS werkzaamheden,
wg.werkbon_global_opmerkingen AS opmerkingen,
wk.werkbon_klant_nummer AS klantnr
FROM
werkbon_klant AS wk
LEFT OUTER JOIN werkbon_global AS wg ON
wg.werkbon_global_id = wk.werkbon_klant_globalid
LEFT OUTER JOIN users AS usr ON
usr.user_id = wg.werkbon_global_monteur_finish
WHERE
wk.werkbon_klant_nummer = '.$db->Quote($klantid).'
ORDER BY id ASC';
$result = $db->loadAssoc($query);
@fred我不需要按列名加引号。您只需要按字符串/blob值添加引号。@johny my的$db->Quote（）函数将自动添加qoutes。我不需要添加它们并将所有内容都放在引号中。
谢谢大家的帮助。