Apr 6, 2016 · sql_delete = "DELETE FROM " + from_table + " WHERE " + from_column + " = %s" sql_data = (usr_to_remove,) cursor.execute(sql_delete, sql_data) See more examples here. Also, if going the second route make sure you understand the potential downsides.

Jan 4, 2020 · I'd like to make a one-query ask to database that will update records, but if one specific record after this change is equal to 0, I'd like to remove this row. Is it possible? Example: UPDATE `table` SET `row1`=`row1`+5, `row2`=`row2`+30 IF (row1 after the update == 0) DELETE WHERE `primarycolumn`=1

Dec 17, 2010 · Update: As answered below, MySQL does not allow the table you're deleting from be used in a subquery for the condition. Attention: Good answer at the bottom stackoverflow.com/a/4471359/956397 simply add the table alias after DELETE t FROM table t ...

If the statement was a SELECT query, you can retrieve the results by calling the getResultSet() method. If the statement was an UPDATE, INSERT, or DELETE statement, you can retrieve the affected rows count by calling getUpdateCount() on the Statement instance.

Sep 2, 2019 · This JDBC tutorial is going to help you learning how to do basic database operations (CRUD - Create, Retrieve, Update and Delete) using JDBC (Java Database Connectivity) API. These CRUD operations are equivalent to the INSERT, SELECT, UPDATE and DELETE statements in SQL language.

UPDATE is a DML statement that modifies rows in a table. An UPDATE statement can start with a WITH clause to define common table expressions accessible within the UPDATE. See Section 15.2.20, “WITH (Common Table Expressions)”. Single-table syntax: {expr | DEFAULT} assignment: col_name = value assignment_list: assignment [, assignment] ...

select T1.C1, T1.C2, T2.C3 FROM T1, T2, [INNER JOIN | LEFT JOIN] T1 ON T1.C1 = T2.C1 WHERE condition. Delete join example. DELETE T1, T2 FROM T1 INNER JOIN T2 ON T1.key = T2.key WHERE condition. Update join example. UPDATE T1, T2, [INNER JOIN | LEFT JOIN] T1 ON T1.C1 = T2. C1 SET T1.C2 = T2.C2, T2.C3 = expr WHERE condition

With MySQL Connector C++, I can use the sql::Statement::execute() function if I am going to modify the database (INSERT, UPDATE, DELETE, MERGE), or the sql::Statement::executeQuery() function if I am going to do a simple read only query.

Aug 12, 2020 · It returns the number of rows affected by the previous query, so run it immediately after your CREATE, UPDATE or DELETE to get the desired total. Result: Many rows can have t1.name="foo". MySQL will not update that row, if it detects that …

Mar 4, 2015 · You can use 2 different sql command: DELETE FROM itemPrice WHERE itemId not in (select itemid FROM Items)); UPDATE itemPrice SET price = 0 WHERE itemId in (select itemid FROM Items));