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What is default value for datetime in MySQL?
CREATE TABLE t1 ( ts1 TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, — default 0 ts2 TIMESTAMP NULL ON UPDATE CURRENT_TIMESTAMP — default NULL ); DATETIME has a default of NULL unless defined with the NOT NULL attribute, in which case the default is 0.
Which statement is correct a table can have *?
A table can have only one primary key. Also, we can create a date variable as a primary key in a table. Unique key also determines each row of the table uniquely, but it can take null value into. A table can have more than one unique key.
How do I select a column by default value in SQL?
In Object Explorer, right-click the table with columns for which you want to change the scale and click Design. Select the column for which you want to specify a default value. In the Column Properties tab, enter the new default value in the Default Value or Binding property.
How to set a default value for a MySQL datetime column?
CAVEAT: IF you define a column with CURRENT_TIMESTAMP ON as default, you will need to ALWAYS specify a value for this column or the value will automatically reset itself to “now ()” on update.
How to change the default value in MySQL?
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘VARCHAR (255) NOT NULL SET DEFAULT ‘ {}” at line 1 A second possibility which does the same (thanks to juergen_d):
Can you use a timestamp function in MySQL?
MySQL (before version 5.6.5) does not allow functions to be used for default DateTime values. TIMESTAMP is not suitable due to its odd behavior and is not recommended for use as input data.
What is the timestamp of 1970 in MySQL?
“The TIMESTAMP data type has a range of ‘1970-01-01 00:00:01’ UTC to ‘ 2038-01-19 03:14:07 ‘ UTC. It has varying properties, depending on the MySQL version and the SQL mode the server is running in. These properties are described later in this section.