MySQL Left Join Help -

-

OK, so I'm using PHP and MySQL to create a Clan Roster page. I have several different tables for which I have to use for this query. Here's how my tables are laid out:

  • Members - Regular members table
  • roster_members - memberID, GameID, rosterXP (experience points that the user earned for the roster

  • Select cr.id as crid, rank_title as cr.title, cr.minimumxp as rank_min, rank_abbr as cr.abport, cr.image rank_image In form, as member_id, rm.rosterxp roster_xp, from rm.gameid as game_id as rm.memberid ".db_PREFIX." Roster_members include rm left as ".db_PREFIX." In crore as clan_ranks (cr.minimumXP & lt; rm.rosterXP) where rm.gameID = ". $ GameID." Group by CR.id order rm.rosterXP DESC

    I think I can understand what your goal is if yes, I do not think that you mean that you want to create a group based on clan ranks, as you say - I think you are on the clan ranks. Are saying to be based. 

      SELECT rm.memberid AS member_id, as rm.rosterxp roster_xp, as rm.gameid game_id, crid, cr.title as rank_title, cr.minimumxp as rank_min , Cr.abage as rank_abbr, cr.image from roster_members as r rank_image as CR.ID as rm left clan_ranks as cr.minimumXP at million = (clan_ranks CRM select CRM.minimumXP Where the minimumXP DESC range by crm.minimumXP & lt; rm.rosterXP order1) Where rm.gameID =: rm.rosterXP by DESC the game_id command   
      join left  Only required if you are in the  roster_members.rosterXP  that> are at their lowest  clan_ranks.minimumXP  not  is the case, then  INNER JOIN  will suffice.   
        
            
             Li> A  INNER JOIN  will restrict the results to records that are completely match 'both' <'>  section  
        •  a  LEFT JOIN < / Li>  
        •   
        •  / code> indicates that joining 'left' will include all records of the specified table (s), even if the record is on the 'right' table ( S). If the records are not present, the  NULL  values ​​for each field defined for that table will be replaced.  
        •  Behind a  right join  only one  LEFT JOIN    
           Note that I have rearranged the fields in the field, it is for readability based on the probability of the records present in the  clan_ranks  if they are not present , Then the field that will look first will contain data (from roster_mailers), and in the result set the field on the right will be further  NULL . This is not a requirement in any way - just a conference.  
           In addition, I removed the database prefix and added a placeholder for readability.

Comments

Post a Comment

Popular posts from this blog

mysql - BLOB/TEXT column 'value' used in key specification without a key length -

-
I have developed an extension which works up to 1.6 on Magren (I'm trying Enterprise Edition, And I think the community is the same problem, because it is the same code). In my install script, I see the $ installer-> gt; CreateEntityTables ($ this- & gt; getTable ('alphanum / info')); The installation is done until it is not in the _text unit table. It crashed there! It turns out that when I log in to SQL and run it via PHPmyadmin, then this error is: Blob / Text column 'value' is used without the key 'key' . I saw the code there, and this is what is trying to create an index on the value column: -> addIndex ($ this- & gt; getIdxName ($ eavTableName, array ( 'attribute_id array (' attribute_id ',' value ')) - & gt; addIndex ($ this- & gt; getIdxName ($ eavTableName, array (' entity_type_id ' , 'Value')), array ('entity_type_id', 'value')) If there is no if statement is n...
Read more

c# - Using Vici cool Storage with monodroid -

-
Oh, for the moment I am not sure how it is officially supported, but for the success of the people Using Monodroid Vic Cool Storage I am able to leave and compile assemblies in my project, but while trying to use some classes, the errors of time have to be gathered. Especially when trying to connect like the example for Mono Touch string dbName = path. Cobain (environment. Gatefolder path (environment specialfolder personal), "mydb.db3"); // The following line will be called coolestation, where is the database, // to make it if it does not exist, and call a delegate that creates the necessary tables (only when the database file was newly created //) CSConfig.SetDB (DbName, true, () => {CSDatabase.ExecuteNonQuery ("Subscriber Integer Primary Key Attribute, Name Text (50) No, Number, Date First Text (30)");); There is no difference when I try to use the methods of CSConfig and when I cscfif If I try to pass 3 aggregates to STDB (3) then I get the invalid ...
Read more

python - referencing a variable in another function? -

-
I am an experienced TCL developer and write my own processes to help myself. I call it a proc i callVar, print out the value of the variable in a certain format, so I know that it is variable and what is the value "set foo 1; putVar foo" result 'foo = "1" I want to do the same thing in Python, but I can not find the answer :( In TCL I use the up command because when I pass the name of the variable, then I can see the value at the top. . I understand that an advanced light in the dragon There is no mechanism of r, but with its introspection capability, I would think that this is something trivial, but I am not getting the answer anywhere. It seems that this should work: and expanded: def foo (): y = "Hello World" printwor ("y") foo () y = "Hello World " You can, but you should not do so if your code is correct If is needed , then there is something wrong with your design, and you should probably use the dictionar...
Read more