you want the 20 top rated or everything but the 20 top rated?
the former:
SELECT * FROM picture WHERE approved='yes' ORDER by avg_vote DESC LIMIT 0, 20
the latter:
SELECT * FROM picture WHERE approved='yes' ORDER by avg_vote DESC LIMIT 20, 99999999
from the mysql manual:
•The LIMIT clause can be used to constrain the number of rows returned by the SELECT statement. LIMIT takes one or two numeric arguments, which must both be nonnegative integer constants (except when using prepared statements).
With two arguments, the first argument specifies the offset of the first row to return, and the second specifies the maximum number of rows to return. The offset of the initial row is 0 (not 1):
SELECT FROM tbl LIMIT 5,10; # Retrieve rows 6-15
To retrieve all rows from a certain offset up to the end of the result set, you can use some large number for the second parameter. This statement retrieves all rows from the 96th row to the last:
SELECT FROM tbl LIMIT 95,18446744073709551615;
With one argument, the value specifies the number of rows to return from the beginning of the result set:
SELECT FROM tbl LIMIT 5; # Retrieve first 5 rows
In other words, LIMIT row_count is equivalent to LIMIT 0, row_count.
For prepared statements, you can use placeholders (supported as of MySQL version 5.0.7). The following statements will return one row from the tbl table:
SET @a=1;
PREPARE STMT FROM 'SELECT FROM tbl LIMIT ?';
EXECUTE STMT USING @a;
The following statements will return the second to sixth row from the tbl table:
SET @=1; SET @numrows=5;
PREPARE STMT FROM 'SELECT * FROM tbl LIMIT ?, ?';
EXECUTE STMT USING @, @numrows;
For compatibility with PostgreSQL, MySQL also supports the LIMIT row_count OFFSET offset syntax.
If LIMIT occurs within a subquery and also is applied in the outer query, the outermost LIMIT takes precedence. For example, the following statement produces two rows, not one:
(SELECT ... LIMIT 1) LIMIT 2;
