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INFORMATION:
TABLE = giveaway
FORM 1 = id
FORM 2 = username
FORM 3 = userid
FORM 4 = wish
END OF INFORMATION
I am trying to make it filter through duplicate usernames and userids
NOTE: people enter the userid and the username (it is for a giveaway)
can anyone post me some code to do that?
Try this one:
SELECT `username`,`userid` FROM `giveaway` group by `username` HAVING COUNT(`username`) > 1 UNION SELECT `username`,`userid` FROM `giveaway` group by `userid` HAVING COUNT(`userid`) > 1
drop table test;
/
create table test
(
id number,
username varchar2(20),
userid number,
wish varchar2(40)
);
/
insert into test
values(1,'A',1,'ZXX');
/
insert into test
values(1,'A',1,'YYY');
/
insert into test
values(1,'B',2,'ZXX');
/
SELECT * FROM
(
SELECT ID ,USERNAME,USERID,COUNT(*) OVER (PARTITION BY USERNAME,USERID) AS CNT
FROM TEST
)
WHERE CNT <2
This will give you unique values
Related
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I am php beginner.
I would like to read email contain in table 1 and with the value selected deleted the corresponding email of the table 2 ?
May you provide me some info to manage it ?
select email_table1 from table1.
delete from table2 where email = email_table1.
Thanks
Greg
There's little information to form an answer but you could use a sub select.
Something like this presuming you're using MySQL or similar.
DELETE FROM `table1` WHERE id = (
SELECT `referenceID` FROM `table2` WHERE `email` = 'the#email.com' LIMIT 1
) LIMIT 1;
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I am trying to fetch bulk data from a website database but could not succeed. Can somebody suggest if SQL injection is possible and how to do in this case.
There are many ways to do SQL Injection to a website similar to the one you provided.
In the where clause it is expecting ac_no. I assume that this value is being passed from the browser as user input. In that case you can pass ac_no value along with or 1 = 1. e.g where ac_no = 123 or 1 = 1. It returns everything from the table RollPdf1.
For string comparison you can add "" = "" to the where clause.
If you want to perform other select operations ( if you know other table names) then you can append select statements delmited by ;.
UNION operator :
If you know the data types of the columns selected in the query then you can use UNION to get additional data from other tables.
e.g
original query : select name, age, sex from table1 where id = 1
sql injected query : select name, age, sex from table1 where id = 1 AND 1 = 2 UNION select username, id, password from userstable or someother table.
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I am working with a MySQL database wherein I have tables named as follows:
Users
1247483647
2147483613
2047483641
The columns in Users are as follows:
userEmail
compId
How can I structure an SQL query which will:
a) Select the compId from the Users table where userEmail is equal to an email address provided via a mysqli prepared statement.
b) Then find the table with a table name which matches the compId and select all data from it?
I have so far tried as follows (to no avail):
$sql = "
SELECT * FROM table_name
WHERE table_name =
(SELECT compId
FROM Users
WHERE userEmail = ?)
";
Thanks in advance.
You have to build the SQL string from the INFORMATION_SCHEMA.TABLES
select #querystring := CONCAT('SELECT * FROM ', table_name)
from information_schema.TABLES
where TABLE_NAME =
(SELECT
compId
FROM
Users
WHERE
userEmail = {?})
PREPARE statement from #querystring;
EXECUTE statement
I'm not the handiest with PHP but this works for me as long as you inject the userEmail in the {?} where I designated as a parameter.
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Here's the link what I mean -
i.stack.imgur.com/yYQbu.png.
Query from 2 columns name and version.(may only with one column I'll put version in name column).
So , Wheres matches name from title or post from same column name and returns all lowest number from version(column).
Can anyone give me example of some query?
So far I have this query:
$name = substr($row[2],0,10);
$q = mysql_query("SELECT name from films WHERE name LIKE '$name'") or die(mysql_error());
I'm assuming your table has an id column as the primary key with auto increment.
In which case, you need to add an ORDER BY and LIMIT to your query.
$q = mysql_query("SELECT name from films WHERE name LIKE '$name' ORDER BY id DESC LIMIT 10") or die(mysql_error());
ORDER BY id DESC will make your query put the latest records first.
LIMIT 10 will ensure that you only grab 10 records.
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can someone please help me with the below mysql query:
I want to build a query like:
UPDATE users
SET ref_id = (select max(ref_id)where `role_id`=5) +1
WHERE user_id =102
AND `role_id`=5
where your FROM clause in subquery???
UPDATE users
SET ref_id =
(select max(ref_id) FROM ???? where role_id=5) + 1
WHERE user_id =102 and role_id=5
Ok I tried a similar request and I had this MySQL error :
1093 - You can't specify target table 'my_table' for update in FROM clause
Try using the following request :
UPDATE `users`
SET
`ref_id` =
(
( SELECT max_id FROM ( SELECT MAX(ref_id) AS max_id FROM users WHERE `role_id`= 5) AS sub_selected_value )
+ 1
)
WHERE `user_id` = 102 AND `role_id` =5
Please keep in mind that may not be the most efficient solution if performance matters because it uses temporary tables.