sql - Define Column Aliases? -

-

I have such a query: 

  SELECT * * 'FROM (` Threads` t, `members`m) where` m``````````` and `t` Type Type = '0' and `t``` Category = '1'

And what happens basically that both tables (members and threads) have an ID field, It is happening that the result is getting messed up ie IE: there is only one ID field which is getting populated from the members table.

What I need to do is create results with the prefix of their nickname so that I can differentiate between two: IE: Add 'T'. All thread fields and 'm' in all members' areas

Then the result should be the same: m.id = x, t.id = y Instead, the results of this time are the same: id = x (thread field is the ID field from the table of members completely (Overwritten from)

Usage: 

  Select MID AS X TIi = M from TID 'Y' members on MT Author and t Column names are defined on a column on a column - you can not use wildcards / etc. Type = '0' and TC Category = '1'


You can use the keyword as or just add columns upper within the single quote if column names do not include special characters - if it does Use double quotes so you can add single / double quote usage with the keyword as .

Do I have a list of all the columns?

Yes, you have until you do not like duplicate columns, because you m * or T. * , then to list all the columns. There is no conference in SQL that you ask. SELECT * .

Appendix

I took the liberty to rewrite your query to use ANSI-92 join syntax - your example ANSI-89 There is no performance difference.


Comments

Post a Comment

Popular posts from this blog

oracle - The fastest way to check if some records in a database table? -

-
I have a big table to work with. I have to see that there are some records whose parent_id is equal to my passing value. Currently I do this by implementing "my_table using select count (*) where parent_id =: id"; If the result> 0, it means that they exist. Because this is a very large table, and I do not care what the actual number of records present, I just want to know if it exists, so I think count (*) Bit is disabled. How do I apply this requirement most quickly? I'm using Oracle 10. # Tips for Hibernation & amp; Tricks It suggests writing in such a way: Integer number = (integer) session .createQuery ("Select Count (*) to ...."). UniqueResult (); I do not know what is the magic of the unique rule? Why does it fast? To compare, select "1 from mytable where parent_id = passId and rowrum", which is more efficient? If you are not interested in the number of records, then there is an EXISTS query one: Select 'y'
Read more

php - multilevel menu with multilevel array -

-
Just ask someone to solve this problem? I want to create a multilevel menu I can not find the right solution generated with multilevel array, it always gets an array_push error My study came from the original idea But still my Can not match the need. This is my MySQL [code] ----- --------------------- --------------- | ID | PARENT_ID | Name | Link | Seq | 1 | 0 | Dashboad | Dashboard / | 1 | 2 | 0 | Menu 1 | Menu 1 / | 2 | 3 | 0 | Menu 2 | Menu 2 / | 3 | 4 | 0 | Menu 3 | Menu 3 / | 4 | 5 | 2 | Joint Add / | 1 | 6 | 3 | Joint Add / | 1 | 7 | 2 | Edit | Edit / | 2 | 8 | 4 | Joint Add / | 1 ------------------------------------------ [/ Code] I want to do something like this in my array array ('dashboard' = & gt; array ('id' = & gt; '' 'Dame' = & gt; 'Dashboard', 'Title' = & gt; 'Dashboard', 'MatchMin' = & gt; Base_URL (). 'Dashboard /', 'Active' => = & Gt; NULL), &
Read more

jQuery UI: Datepicker month format -

-
I am trying to change the format of the month that shows in the popup (not in the date that the picker actually I do not have any choice anywhere to do this, do I like to use a sub-string () or something else? What I normally display is Trying to change: Class = "ui-datepicker-title"> January & lt; / span & gt; ... & lt; / div & gt; Div>
Read more