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MariaDB [test]> set sql_mode='';
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Query OK, 0 rows affected (0.00 sec)
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MariaDB [test]> create table t1(a timestamp, b timestamp);
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Query OK, 0 rows affected (0.11 sec)
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MariaDB [test]> set sql_mode = 'NO_ZERO_DATE';
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Query OK, 0 rows affected (0.00 sec)
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MariaDB [test]> create table t2(a timestamp, b timestamp);
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ERROR 1067 (42000): Invalid default value for 'b'
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MariaDB [test]> create table t2(a timestamp, b int, c timestamp);
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ERROR 1067 (42000): Invalid default value for 'c'
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MariaDB [test]> create table t2(a timestamp);
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Query OK, 0 rows affected (0.07 sec)
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Index creation is affected as well.
MariaDB [test]> set sql_mode='';
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Query OK, 0 rows affected (0.00 sec)
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MariaDB [test]> create table t1(a timestamp, b timestamp);
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Query OK, 0 rows affected (0.06 sec)
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MariaDB [test]> set sql_mode='NO_ZERO_DATE';
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Query OK, 0 rows affected (0.00 sec)
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MariaDB [test]> create index idx on t1(a);
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ERROR 1067 (42000): Invalid default value for 'b'
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MariaDB [test]> set sql_mode='NO_ZERO_DATE,STRICT_TRANS_TABLES';
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Query OK, 0 rows affected (0.01 sec)
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MariaDB [test]> create index idx on t1(a);
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ERROR 1292 (22007): Incorrect datetime value: '0000-00-00 00:00:00' for column 'b' at row 1
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Also, it seems impossible to use current_timestamp in CREATE TABLE .. ON UPDATE.
MariaDB [test]> set sql_mode = 'NO_ZERO_DATE';
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Query OK, 0 rows affected (0.00 sec)
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MariaDB [test]> create table t1 (a timestamp(5) on update current_timestamp(5));
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ERROR 1067 (42000): Invalid default value for 'a'
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MariaDB [test]> create table t1 (a timestamp(5) on update current_timestamp(4));
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ERROR 1294 (HY000): Invalid ON UPDATE clause for 'a' column
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MariaDB [test]> create table t1 (a timestamp(5) on update current_timestamp(6));
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ERROR 1067 (42000): Invalid default value for 'a'
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MariaDB [test]> create table t1 (a timestamp on update current_timestamp);
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ERROR 1067 (42000): Invalid default value for 'a'
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