HiRDB has equivalent for Trunc(date) with YEAR, SYYYY, YYYY, SYEAR, YYY, YY, Y formats. SQLWays changes it to truncyear function.

Oracle:

SELECT TRUNC(c1, 'YEAR'),
TRUNC(c1, 'SYYYY'),
TRUNC(c1, 'YYYY'),
TRUNC(c1, 'SYEAR'),
TRUNC(c1, 'YYY'),
TRUNC(c1, 'YY'),
TRUNC(c1, 'Y') FROM t; 

HiRDB:

SELECT truncyear(c1),
truncyear(c1),
truncyear(c1),
truncyear(c1),
truncyear(c1),
truncyear(c1),
truncyear(c1) FROM t;

HiRDB hasn't equivalent for Trunc(date) with others formats. SQLWays leaves it as is and adds message /*Сould not convert ' TRUNC ' */.

Oracle:

SELECT TRUNC(c2, 'DAY') FROM t; 

HiRDB:

SELECT TRUNC(c2, 'DAY') FROM t;
/*Сould not convert ' TRUNC '*/

HiRDB has equivalent for Trunc with unknown parameter’s data type. SQLWays leaves it as is and adds message /* SQLWays: This conversion has inappropriate possibility */.

Oracle:

create table test_func_types1

( c1 float, c2 float ); select TRUNC(c3,'Y') into n FROM test_func_types1;

HiRDB:

create table test_func_types1

( c1 float, c2 float ); select TRUNC(c3,'Y') into n FROM test_func_types1; /* SQLWays: This conversion has inappropriate possibility */