Posts tagged with sql:

MySQL, MariaDB, SQLite, PostgreSQL, Oracle, MS SQL, DB2 - differenceWhat is the difference between MySQL, MariaDB, SQLite, PostgreSQL, Oracle, MS SQL and IBM DB2 ? Which one is better than the other ? Do they work with regular SQL language ?

Error: Illegal parameter data types INT and row for operation '='I am trying to use SELECT in SELECT in SQL query, to count the matches, but I am getting SQL error: Illegal parameter data types INT and row for operation '=' What...

Fix error: mysqli_select_db / query expects 2 arguments, 1 givenI have upgraded MySQL to a higher version, but I am getting an error: Fatal error: Uncaught ArgumentCountError: mysqli_select_db() expects exactly 2 arguments, 1 given How...

Fatal error: Call to undefined function mysql_connect() - PHPI have uploaded the php files on new hosting and when I enter URL address into browser, I get this error: Fatal error: Uncaught Error: Call to undefined function...

Fatal error: Call to undefined function mysql_query() - PHPOn my new hosting, when I try to get the data from MySQL database with SELECT statement, the following error notification appears: Fatal error: Uncaught Error: Call to...

Difference between Fetch_assoc, Fetch_array, Fetch_row - MySQLWhat is the difference between Fetch_assoc, Fetch_array and Fetch_row in MySQL. When is it effective to use each of them ?

Using Update and Left Join in SQL together not working - exampleI need to use UPDATE and LEFT JOIN functions together in SQL, but it is not working. I am receiving the error notification: You have an error in your SQL syntax; check the...

Insert or update current date in DATETIME format - SQLWhat SQL function should I use to insert or update current date in DATETIME format in table cell ? I tried to use GETDATE() but it is not working.

Is faster one big SQL query or multiple small SQL queries ?I need to optimize the SQL queries to make them faster. Is it better to run one big query or more small queries ?

SQL to calculate total balance amount of each owner - debit/creditHow should the SQL Select look like, if I need to get the total account balance for each customer, from debit and credit transactions ? Table looks like: Transaction ID,...