with_for_update sqlalchemy SELECT users.id AS users_id FROM users FOR UPDATE OF users NOWAIT with_for_update sqlalchemy q = sess.query(User).populate_existing().with_for_update(nowait=True, of=User)

will sqlite update create a new row if row doesnt exist INSERT INTO example(column1, column2) SELECT value_to_insert1, value_to_insert2 WHERE NOT EXISTS(SELECT 1 FROM example WHERE column1 = value_to_insert AND column2 = value_to_insert);

wherein mysql SELECT Id FROM Table WHERE NAME IN (‘John’, ‘Jim’, ‘Bill’) mysql query where in SELECT * FROM `tableName` WHERE `ColumnName` IN (1,2,3);

laravel query not null DB::table(‘users’) ->whereNotNull(‘name’) ->get(); where status is null sql in laravel DB::table(‘users’) ->whereNull(‘name’) ->get();

where query in sql server SELECT * FROM Customers WHERE Country=’Mexico’;

where in mysql w3schools SELECT * FROM `tableName` WHERE `ColumnName` IN (1,2,3); SQL SELECT WHERE SELECT column1, column2, … FROM table_name WHERE condition;

whats sql SQL stands for Structured Query Language. It’s the language of choice on today’s web for storing, manipulating and retrieving data within relational databases. Most, if not all of the websites you visit will use it in some way. Using SQL, you are able to interact with the database by writing queries, which when […]

what is sql Structured Query Language A language which enables a user to create, modify and essentially interact with a database. Two of the most common Database Management Engines are MySQL: https://www.mysql.com/ PostgreSQL: https://www.postgresql.org/ what is sql SQL stands for: Structured Query Language It’s language which enables a user to create, modify and essentially interact […]

what is self join in sql Self is joining a table to itself. — assume employee table as 2 different table using different alias — as manager and worker — we want to join these 2 virtual manager and worker table — to get manager’s first name and worker’s first name — our condition is […]

what is purpose of cursor in sql A SQL Server cursor is a set of T-SQL logic to loop over a predetermined number of rows one at a time. The purpose for the cursor may be to update one row at a time or perform an administrative process such as SQL Server database backups in […]