logo
down
shadow

Selecting rows with null in integer columns using mysql query


Selecting rows with null in integer columns using mysql query

By : Akrty
Date : November 18 2020, 03:49 PM
fixed the issue. Will look into that further In MySQL, NULL is considered as a 'missing, unknown value', as opposed to no value. Any arithmetic comparison with NULL does not return true or false, but returns NULL instead., So, NULL != 'C' returns NULL, as opposed to returning true.
Use IS NULL condition in your query and try like this
code :
SELECT * FROM `datatablecoulmn` WHERE `FkID` IS NULL


Share : facebook icon twitter icon
MySQL query selecting the least non-null, non-zero integer

MySQL query selecting the least non-null, non-zero integer


By : Lukini
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I have a table that has 5 columns: uniqueid, int1, int2, int3, and FruitStand. What I'm looking for is an example on how to do a single select that outputs the data of whichever column has the least non-null, non-zero integer.
code :
SELECT uniqueid,
FruitStand,
LEAST(
    COALESCE(int1, int2, int3),
    COALESCE(int2, int3, int1),
    COALESCE(int3, int1, int2)) AS number
FROM myTable
json_encode for mysql query returns some null columns of some rows, but the columns aren't null

json_encode for mysql query returns some null columns of some rows, but the columns aren't null


By : Gregory Krasnopolsky
Date : March 29 2020, 07:55 AM
around this issue It's an encoding problem. json_encode() accepts only UTF-8 strings, and returns null if a string is not valid UTF-8.
You can fix this by converting the encoding of your data before passing it to json_encode. Take a look at iconv() or mb_convert_encoding().
code :
$e = array_map(function($string) {
    return iconv("iso-8859-1", "utf-8", $string);
}, $e);

$output[] = $e;
function cb($string) {
    return iconv("iso-8859-1", "utf-8", $string);
}

$e = array_map('cb', $e);

$output[] = $e;
MySQL - Selecting rows with null columns

MySQL - Selecting rows with null columns


By : amibingo
Date : March 29 2020, 07:55 AM
this will help How can I select any row that contains empty or null column? , the best answer that does not need to hard-code the column names is:
code :
DECLARE @sqlStr VARCHAR(max) = (
        SELECT stuff((
                    SELECT 'and ' + c.NAME + ' is null '
                    FROM sys.columns c
                    WHERE object_name(object_id) = 'yourtablename'
                    ORDER BY c.NAME
                    FOR XML PATH('')
                    ), 1, 3, '')
        )

SET @sqlStr = 'select * from ' + yourtablename + ' where ' + @sqlStr

PRINT @sqlStr

EXEC (@sqlStr)
Selecting where data `not exists` and selecting columns that are empty or `is null` - MySQL

Selecting where data `not exists` and selecting columns that are empty or `is null` - MySQL


By : Already Waiting
Date : March 29 2020, 07:55 AM
it should still fix some issue This is the query I have currently: , Put some brackets in
code :
select * 
from outerb 
where 
  not exists(
   select * 
   from wms
   where 
     wms.barcode = outerb.barcode
  ) 
  and (pcode = '' or pcode is null)
  and (brand = '' or brand is null);
a AND b OR c AND d OR e
(a AND b) OR (c AND d) OR e --MySQL does
a AND (b OR c) AND (d OR e) --you wanted
Selecting rows where out of two columns one is null

Selecting rows where out of two columns one is null


By : B Valentine
Date : March 29 2020, 07:55 AM
To fix the issue you can do Out of two search selections if a visitor select one only there is no search result. Following is my sql query: , In PHP construct your query:
Related Posts Related Posts :
  • How to handled the null values in WHERE IN condition in mysql
  • Is it okay to update primary key field to shift a record to the top?
  • Stop query through pdo
  • How to check whether particular value in field in MySQL exists
  • Execute a statement for every table in a database
  • insertion 74G data into mysql table cost more then 2 days, how to improve insert performance
  • Where can I see the differents "Hibernate Console Configurations" in Eclipse
  • MySql | relational database vs non relational database in terms of Performance
  • Exporting mysql database using mysqldump including procedures
  • Trigger MySQL not working
  • How do I update values for individual rows quickly?
  • MySQL join query with multiple where condition
  • MySQL stored procedure is not working
  • MySQL - Order By exact match at the end
  • Select max date or null date from same table MySQL
  • Best solution workaround for needing a mysql event on insert?
  • MySQL select several columns of several tables at the same time without using JOIN
  • Is it more efficient to have a table with one of its columns mostly empty or make a new table and refer to it?
  • mysql data truncated with ñ character
  • MySQL Distinct Active Users for the last month query
  • Get all rows that match another attribute in the same table
  • MySQL statement to get min value with max ID
  • DATEDIFF Current/Date for Last Record
  • What is the logic or procedure for combining multiple DB query's results into one elegant table?
  • Modify TIMESTAMP MySQL for use as Primary Key
  • Django - Efficiently bulk create inherited models
  • MySQL Dual table Join Dual table
  • Ruby on Rails - database where sorted by id
  • MySQL 5.6 : Access denied for user 'root' @ 'localhost' when password contains backslash
  • sql query case dateadd
  • Click on one button multiple times and mySql
  • Select daily amount of specific values from same column
  • How to send e-mail to users within a database?
  • Updating self joined table
  • Convert query to a Left-Join (?) to include userid's without a match
  • How to Convert from .Net TimeZone to MySQL TimeZone
  • Syntax Error for MySQL Trigger
  • SQL Optimization - 3 Tables - Multiple SUMs - 20k records - 12 Seconds
  • MySQL: Why does query give NULL as a result of SUM?
  • Simple query issue with multiple tables and mismatching IDs
  • MySQL join multiple lines
  • Performing JOIN between two tables
  • Get specific rows from group by clause in PostgreSQL
  • MySQL query to get the sum of a column
  • Why mongoDB takes less time for Select than Fetch time?
  • Laravel 4.2 BIT datatype issue
  • MySQL Join Query confuse
  • Select distinct rows by count in descending order
  • Select query with comma and join
  • Adding a percentage (%) sign to each value while using select sql statement
  • How to access data from foreign key table
  • How to use the SQL MINUS keyword
  • Mysql Left Join statement ignored during query
  • Mysql version is different in phpmyadmin
  • MySQL: creating comma separated list and using in IN
  • calculating total time using timestamp
  • SQL LIKE REGEXP Matching Single Value and Comma'd String
  • one table or several table in mysql
  • Using MySQL Database Triggers
  • Trying to get TOP 10 products per sales channel
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org