Unlike SQL databases, where you must determine and declare a table's schema before inserting data, MongoDB's collections do not enforce document structure.
Furthermore, most of these platforms are designed to work with one or more traditional programming languages, be it Python, Django, Javascript, SQL or anything in-between.
Beginning with MySQL 4.1, you can also change the mode at runtime by setting the sql_mode system variable with a SET[SESSION|GLOBAL] sql_mode='mode_value' statement.
Beginning with MySQL 4.1, you can also change the mode after startup time by setting the sql_mode variable with a SET[SESSION|GLOBAL] sql_mode='modes' statement.
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