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Instead of DUAL you can use (at least in mysql) INSERT INTO table (value1, value2) SELECT 'stuff for value1', 'stuff for value2' FROM (select 1) x WHERE NOT EXISTS (SELECT * FROM table WHERE value1='stuff for value1' AND value2='stuff for value2');
30 mar 2022 · Learn how to use the EXISTS operator in MySQL to check if a subquery returns any row. See examples of EXISTS with SELECT, INSERT and DELETE statements.
24 lip 2024 · Methods for Insert Row If Not Exists. There are 4 methods to use insert row if not exists: Using INSERT IGNORE; Using ON DUPLICATE KEY UPDATE; Using REPLACE; Using NOT EXISTS with INSERT; Method 1: Using insert ignore. Query: INSERT IGNORE INTO Student (id, name) VALUES (2, 'Aman'); Output: STUDENT Table
21 mar 2023 · Learn three ways to perform an "insert if not exists" query in MySQL using INSERT IGNORE, ON DUPLICATE KEY UPDATE, or REPLACE statements. See examples, explanations, and tips for each method.
2 lut 2024 · This tutorial demonstrates how to insert if certain values do not exist in the column of a table using in MySQL database.
12 cze 2024 · When managing a database, the need often arises to either insert a new record or update an existing one. MariaDB provides a powerful tool to handle this situation efficiently: the SQL IF NOT EXISTS clause. This clause allows us to perform an INSERT operation only if the record does not already exist, or an UPDATE operation if it does. In this artic
If a subquery returns any rows at all, EXISTS. subquery is TRUE, and NOT EXISTS. subquery is FALSE. For example: SELECT column1 FROM t1 WHERE EXISTS (SELECT * FROM t2); Traditionally, an EXISTS subquery starts with SELECT *, but it could begin with SELECT 5 or SELECT column1 or anything at all.
