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Wanted to delete complete row, which contains NULL entries in sql with command
DELETE FROM student WHERE ID=NULL;
What is wrong in this code?
Your syntax is incorrect you need to check for IS NULL
DELETE FROM student WHERE ID IS NULL;
Adding link to documentation thanks to D M
Working with NULL values
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class table
class table
students table
students table
teacher's table
teacher's table
expected output table
expected output table
i tried left join but i am getting multiple record's getting.
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I have table like this :
then i want query data like this :
how did to do that?
A subquery with group by should do the job:
select * from <table_name>
where (serial_number, attempt) in (select serial_number, max(attempt) from <table_name> group by serial_number)
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I am getting an error when setting a decimal value in MySQL workbench.
What am I doing wrong here?
See screenshot.
Can you removed the () from the DECIMAL() and instead enter the DECIMAL only.
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I have the following table where there are two relevant fields for searching, this is 'from' and 'to' and represents the range of employees and then the field 'InitialQMSDays' represents the value that I want to return.
So if I have a search value of say 6, it would look at that value and find it between the 6 - 10 row, and return 2.
any ideas?
SELECT InitialQMSDays
FROM my_table
WHERE 6 BETWEEN `From` AND `To`;
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Hi I need to update multiple rows in a table so I wrote below query, but it only updates the first row and not the others. Please help.
Query:
String sql = "REPLACE INTO subscriber_metadata (msisdn, have_had_speech_pkg, have_had_sms_pkg, created, changed) values ";
Well REPLACE INTO does the following DELETE + INSERT, what you're looking for is UPDATE, doc over here
REPLACE INTO is nothing more than a mechanical DELETE and INSERT. It can incite mysqld to address deadlocks (See my answer to How I prevent deadlock occurrence in my application?)