... 0,, `field3 ` `field3 ` datetimedatetime,,primary keyprimary key ( `field1 `, `field2 `), ( `field1 `, `field2 `),indexindex ( `field1 `), ( `field1 `),uniqueunique ( `field3 `) ( `field3 `)) ) ... mytable;–insert intoinsert into mytable mytable setset field1 = ‘abc’, field2 = 1, field3 = field1 = ‘abc’, field2 = 1, field3 = nownow();(); ... ( `field1 ` `field1 ` charchar(10) (10) collatecollate utf8_unicode_ciutf8_unicode_ci not nullnot null,, `field2 ` `field2 ` int unsigned default 0int unsigned default 0,, `field3 `...