mysql if exists code example

Example 1: mysql create table if not exists example

CREATE TABLE IF NOT EXISTS checklists (
    todo_id INT AUTO_INCREMENT,
    task_id INT,
    todo VARCHAR(255) NOT NULL,
    is_completed BOOLEAN NOT NULL DEFAULT FALSE,
    PRIMARY KEY (todo_id , task_id),
    FOREIGN KEY (task_id)
        REFERENCES tasks (task_id)
        ON UPDATE RESTRICT ON DELETE CASCADE
);Code language: SQL (Structured Query Language) (sql)

Example 2: mysql check if value exists

mysql> SELECT EXISTS(SELECT * from ExistsRowDemo WHERE ExistId=105);

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