如何在MySQL PHP中更新多个表

Question

谁能告诉我这段代码有什么问题

$sql = "
UPDATE graduation
     , classxii
     , classx
   SET university = '$university'
     , college ='$college'
     , course = '$course'
     , branch = '$branch'
     , year = '$year'
     , school1 = '$school1'
     , board1 = '$board1'
     , percentage1 = '$percentage1'
     , year1 = '$year1'
     , school2 = '$school2'
     , board2 = '$board2'
     , percentage2 = '$percentage2'
     , `year2 = '$year2'
     WHERE graduation.email = '$email'
     , classxii.email = '$email'
     , classx.email = '$email'
";

错误：您的SQL语法有错误； 查看与您的MySQL服务器版本相对应的手册，以在' classxii.email =' classx.email @gmail.com'， classx.email ='rajdeep@gmail.com'附近使用正确的语法

Answer 1

需要使用AND或OR而不是逗号来连接多个条件。

$sql = "UPDATE `graduation`, `classxii`, `classx` SET 
    `university`='$university',`college`='$college',`course`='$course',`branch`='$branch',`year`='$year',
    `school1`='$school1',`board1`='$board1',`percentage1`='$percentage1',`year1`='$year1',
    `school2`='$school2',`board2`='$board2',`percentage2`='$percentage2',`year2`='$year2'
WHERE `graduation`.`email`='$email' AND `classxii`.`email`='$email' AND `classx`.`email`='$email'";

另外， . 将表名与列名分隔开来的分隔符不得位于反引号之内。

您的表名或列名都不是保留字，因此您根本不需要所有那些嘈杂的反引号。

$sql = "UPDATE graduation, classxii, classx SET 
    university='$university',college='$college',course='$course',branch='$branch',year='$year',
    school1='$school1',board1='$board1',percentage1='$percentage1',year1='$year1',
    school2='$school2',board2='$board2',percentage2='$percentage2',year2='$year2'
WHERE graduation.email='$email' AND classxii.email='$email' AND classx.email='$email'";