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Which query to use: REPLACE/WHERE NOT EXISTS/NOT IN

There is a one to many relation in the database which needs to be updated.
There is a table tasks and a table users which are linked with a table task_users containing three columns: id, task_id, user_id. There could be more than one user coupled to a task at a time so there could be entries like:

Which query to use: REPLACE/WHERE NOT EXISTS/NOT IN

There is a one to many relation in the database which needs to be updated.
There is a table tasks and a table users which are linked with a table task_users containing three columns: id, task_id, user_id. There could be more than one user coupled to a task at a time so there could be entries like:

Which query to use: REPLACE/WHERE NOT EXISTS/NOT IN

There is a one to many relation in the database which needs to be updated.
There is a table tasks and a table users which are linked with a table task_users containing three columns: id, task_id, user_id. There could be more than one user coupled to a task at a time so there could be entries like:

Which query to use: REPLACE/WHERE NOT EXISTS/NOT IN

There is a one to many relation in the database which needs to be updated.
There is a table tasks and a table users which are linked with a table task_users containing three columns: id, task_id, user_id. There could be more than one user coupled to a task at a time so there could be entries like:

Which query to use: REPLACE/WHERE NOT EXISTS/NOT IN

There is a one to many relation in the database which needs to be updated.
There is a table tasks and a table users which are linked with a table task_users containing three columns: id, task_id, user_id. There could be more than one user coupled to a task at a time so there could be entries like:

Which query to use: REPLACE/WHERE NOT EXISTS/NOT IN

There is a one to many relation in the database which needs to be updated.
There is a table tasks and a table users which are linked with a table task_users containing three columns: id, task_id, user_id. There could be more than one user coupled to a task at a time so there could be entries like: