Menu
I need to do this
DELETE FROM konta WHERE taken != ''
But != doesn't exist in mysql. Anyone know how to do this?
463
In MySQL, you can use the <> or != operators to test for inequality in a query. For example, we could test for inequality using the <> operator, as follows: SELECT * FROM contacts WHERE last_name <> 'Johnson';
We can use both SQL Not Equal operators <> and != to do inequality test between two expressions. Both operators give the same output. The only difference is that '<>' is in line with the ISO standard while '!=
If != and <> both are the same, which one should be used in SQL queries? Here is the answer – You can use either != or <> both in your queries as both technically same but I prefer to use <> as that is SQL-92 standard.
NOT negates the following condition so it can be used with various operators. != is the non-standard alternative for the <> operator which means "not equal". e.g. In some situations it might be easier to understand to negate a complete expression rather then rewriting it to mean the opposite.
DELETE FROM konta WHERE taken <> '';
The != operator most certainly does exist! It is an alias for the standard <> operator.
Perhaps your fields are not actually empty strings, but instead NULL?
To compare to NULL you can use IS NULL or IS NOT NULL or the null safe equals operator <=>.
44
You may be using old version of Mysql but surely you can use
DELETE FROM konta WHERE taken <> ''
But there are many other options available. You can try the following ones
DELETE * from konta WHERE strcmp(taken, '') <> 0;
DELETE * from konta where NOT (taken = '');
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
