Required single query to fetch data from tables

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醉梦人生
醉梦人生 2021-01-14 07:50

I have the following tables

     //all users deails
    smsusers(id,fname , lname ,primary key(id));

 //message details of users
 //one smsusers can have N          


        
3条回答
  •  花落未央
    2021-01-14 08:54

    1)all details from user_message

    SELECT * FROM user_messages WHERE userid =  AND messageid = ;
    

    2)last 10 comments related to messageid in ascending order from comments table (one message can have multiple comments)which includes comment_id ,comment, comment_date,and details of commented_by(fname,lname,small_pic_path).

    SELECT a.comment_id, a.comment, a.comment_date, b.fname || b.lname || c.small_pic_path "Commented by" 
    FROM comments a, smusers b, profile_pic c, user_messages d
    WHERE d.messageid = 
    AND d.userid = b.id
    AND b.id = c.userid
    ORDER BY comment_date
    LIMIT 0, 10;
    

    3)all small_pic_path from post_images(one message can have multiple images),

    SELECT small_pic_path
    FROM post_images;
    

    4)total likes from like table,

    SELECT * FROM likes;
    

    5)all details (smsusers.*,profile_pic.*) of sentby

    You have not posted the structure of sentby
    

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