描述

如果不存在具有给定波段编号的波段，则返回TRUE。如果未指定波段编号，则假定波段编号为1。

可用性：2.0.0

示例

SELECT rid, ST_HasNoBand(rast) As hb1, ST_HasNoBand(rast,2) as hb2,
ST_HasNoBand(rast,4) as hb4, ST_NumBands(rast) As numbands
FROM dummy_rast;

rid | hb1 | hb2 | hb4 | numbands
-----+-----+-----+-----+----------
1 | t   | t   | t   |        0
2 | f   | f   | t   |        3
            

另请参阅

ST_NumBands