求助关于SQL语句的实现
有发下的表,我要实现的是取每一种fitemid的最近时间的记录,如705取705 2010 2 364.9 0.68这条记录,而741则取741 2010 1 4421 10.69 这条记录,请问如何实现?fitemid fyear fperiod fbegqty fbegbal
705 2008 6 45047.0000000000 208545.00
705 2008 7 3749.0000000000 15384.81
705 2008 8 2451.0000000000 3.03
705 2008 9 1880.5000000000 71.85
705 2008 10 3009.5000000000 36.56
705 2009 9 1674.0000000000 2.99
705 2009 11 2645.0000000000 4.46
705 2009 12 2609.0000000000 5.01
705 2010 1 4126.0000000000 9.23
705 2010 2 364.9000000000 0.68
741 2008 6 2408.9100000000 3.02
741 2008 7 3490.0000000000 22.71
741 2008 8 4094.0000000000 2.08
741 2008 9 2553.0000000000 3.79
741 2008 10 4603.0000000000 1.44
741 2008 11 13417.0000000000 10.69
741 2008 12 15892.0000000000 27.69
741 2009 1 39519.0000000000 47.69
741 2009 3 21589.0000000000 12.77
741 2009 4 19399.0000000000 15.75
741 2009 5 5196.0000000000 6.12
741 2009 7 5035.5000000000 8.10
741 2009 8 2632.5000000000 3.48
741 2009 9 4981.5000000000 9.76
741 2009 11 2175.0000000000 4.18
741 2009 12 3886.0000000000 9.33
741 2010 1 4421.0000000000 10.69
