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PHP and mysql, SELECT query return null


PHP and mysql, SELECT query return null

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PHP and mysql, SELECT query return null
Tag : php , By : unfool
Date : November 23 2020, 01:01 AM

this one helps. this is PHP code: , tanks to gaurav kumar this is correct code :D
$sql_rank="SELECT * FROM `tmp` WHERE DID LIKE ".$d."";
$res=mysql_query($sql_rank,$My_Connection);
$r=mysql_fetch_assoc($res);
$rank= $r;

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Compound MySQL query to return null if first part is null or result otherwise


Tag : mysql , By : Techspirit
Date : March 29 2020, 07:55 AM
it should still fix some issue I want to make a compound query into MySQL. If the first part of the union is null, I want to return null; otherwise, I want to return the result of the union. Example:
( SELECT * FROM t1 )
UNION 
( SELECT * FROM t2 
  WHERE EXISTS
        ( SELECT * FROM t1 )
)

MYSQL Out Parameter will always return null for select query


Tag : mysql , By : algoRhythm99
Date : March 29 2020, 07:55 AM
it helps some times You are doing assignment in select statement.
You can set the value using set statement,. First set the value like
SET <variablename> = <value>;
SELECT <variable name>;
SELECT <colname>,<colname> ..INTO <variable>, <variable> from <tbl>.

mysql select query result is null so how can i return default value in php


Tag : php , By : Stone
Date : March 29 2020, 07:55 AM
should help you out As mentioned by Vikas Umrao and shadyyx, you should change the query and the if condition as below:
Change:
 $rs = $this->db->query("SELECT vendhq_id as id FROM ".DB_PREFIX."vendhq_product WHERE vendhq_id = '".$flagChk."'");

 $rowRsl=-1;
 if($rs===null)
 $rs = $this->db->query("SELECT vendhq_id as id FROM ".DB_PREFIX."vendhq_product WHERE vendhq_id = '".$this->db->escape($flagChk)."'");

 $rowRsl=-1;
 if(!$rs->num_rows){

If select query returns null then return lastest entry from db in mysql


Tag : mysql , By : Naveen
Date : March 29 2020, 07:55 AM
it helps some times I have below query which return a result set for certain time interval, like 1 min, 10min, 1hour etc. [below is working e.g. for 10min.]
SELECT
  COALESCE(t.MemoryUsage, t2.MemoryUsage),
  COALESCE(t.TransactionTime, t2.TransactionTime), 
  COALESCE(t.moduleid, t2.moduleid)
FROM (
  SELECT *
  FROM tbl_trnmemoryusage 
  ORDER BY TransactionTime DESC
  LIMIT 1
  ) t2
LEFT JOIN (
  SELECT *
  FROM tbl_trnmemoryusage
  WHERE TransactionTime BETWEEN (NOW() - INTERVAL 10 MINUTE) and NOW() 
  ORDER BY TransactionTime ASC
) t
ON 1

mySQL select query does not return results when using a WHERE clause against a NULL column.


Tag : mysql , By : user112141
Date : March 29 2020, 07:55 AM
I wish did fix the issue. This behavior is caused by a three-value logic that is part of SQL standard. It means that every boolean condition can be evaluated to true, false or unknown and the row is returned only when the condition is true. It is defined that if there is a NULL value on one side of the equation (or both) then the result is unknown. In your case, the result of the condition is unknown when field3 is NULL. Therefore you need to use a solution proposed by jarlh:
SELECT * FROM table WHERE field3 <> 'randomstring' or field3 IS NULL
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