change the color of a multispectral Raster Image using Postgre/PostGIS query

Would like to change the color of a multispectral Raster Image. looking for changing band rendering values for Red, green and Blue bands uisng postgre/postGIS query. Please help me.

I have loaded the raster Image into a Table. But wanted to change the colour of bands uisng SQl queries without using QGIS