Improve extract(day) documentation with interval values.
Branch------master
Details-------http://git.postgresql.org/pg/commitdiff/cbd2811461daf2c6b71d56048b96374cc2d61d64
Modified Files--------------doc/src/sgml/func.sgml | 11 +++++++++--1 files changed, 9 insertions(+), 2 deletions(-)
