What is a default in database?

Question

Default values, in the context of databases, are preset values defined for a column type. Default values are used when many records hold similar data. 2 мая 2013 г.

What is default in SQL database?

The DEFAULT constraint is used to set a default value for a column. The default value will be added to all new records, if no other value is specified.

What is meant by default value in SQL?

The default value is used for the column's value when one is not specified (for example, when you insert a row into the table without specifying a value for the column). You can add a default constraint either when creating a table or after the table already exists.

What is the meaning of default value?

default value means a value derived from a typical value by the application of pre-determined factors and that may, in circumstances specified in this Directive, be used in place of an actual value.

What is the default datatype?

For numeric types, the default is 0 , with the exception that for integer or floating-point types declared with the AUTO_INCREMENT attribute, the default is the next value in the sequence. For date and time types other than TIMESTAMP , the default is the appropriate “zero” value for the type.

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