Question

$sql="SELECT user_id, user_fname, user_lname, telephone, primary_email, dept_name, created_date, st_name, emp_level_name
            FROM ".$prefix."users_info, 
            ".$prefix."support_departments,
            /".$prefix."user_status,
            ".$prefix."company_user_levels
            WHERE ".$prefix."users_info.dept_id=".$prefix."support_departments.dept_id,
            ".$prefix."users_info.user_st=".$prefix."user_status.user_st,
            ".$prefix."users_info.user_level=".$prefix."company_user_levels.emp_level_id
            ORDER BY ".$sort_para." ";
            $employee_info = $wpdb->get_results($sql);

Answer 1

在WHERE语句中，用'＃34;替换comas; AND＆＃34;：

$sql = "SELECT user_id, user_fname, user_lname, telephone, primary_email, dept_name, created_date, st_name, emp_level_name
FROM ${prefix}users_info, ${prefix}support_departments, ${prefix}user_status, ${prefix}company_user_levels
WHERE ${prefix}users_info.dept_id=${prefix}support_departments.dept_id AND ${prefix}users_info.user_st=${prefix}user_status.user_st AND ${prefix}users_info.user_level=${prefix}company_user_levels.emp_level_id
ORDER BY ".$sort_para;
$employee_info = $wpdb->get_results($sql);

Answer 2

把＆＃34; AND＆＃34;放错了什么？或＆＃34;或＆＃34;条件之间的条款而不是逗号？

Answer 3

您需要使用join来从多个表中获取数据，

FROM ".$prefix."users_info ui    
join  ".$prefix."user_status su on su.FOREIGNKEY = ui.PRIMARY

此外，在需要在每种情况之间使用AND或OR条件的情况下

WHERE ".$prefix."users_info.dept_id=".$prefix."support_departments.dept_id AND 
        ".$prefix."users_info.user_st=".$prefix."user_status.user_st

我可以在此查询的where子句中使用多个条件吗？

3 个答案: