In SQL Server, the usual version number is named a large version. Iteration update this form, such as 9.X.XXX, is SQL Server 2005. I'll make a list of versions in SQL Server that correspond to the version number for easy access.
SQL Server 2005 version (9.X)
--SQL SP2 builds SQL SP3 builds SQL, SP4 builds
--Build Description builds Description build Description
--3042 SP2 RTM 4035 SP3 RTM
--3161 SP2 CU1 4207 SP3 CU1
--3175 SP2 CU2 4211 SP3 CU2
--3186 SP2 CU3 4220 SP3 CU3
--3200 SP2 CU4 4226 SP3 CU4
--3215 SP2 CU5 4230 SP3 CU5
--3228 SP2 CU6 4266 SP3 CU6
--3239 SP2 CU7 4273 SP3 CU7
--3257 SP2 CU8 4285 SP3 CU8
--3282 SP2 CU9 4294 SP3 CU9
--3294 SP2 CU10 4305 SP3 CU10
--3301 SP2 CU11 4309 SP3 CU11---> 5000 SP4 RTM
--3315 SP2 CU12 4311 SP3 CU12---> 5254 SP4 CU1
--3325 SP2 CU13 4315 SP3 CU13
--3328 SP2 CU14 4317 SP3 CU14---> 5259 SP4 CU2
--3330 SP2 CU15 4325 SP3 CU15---> 5266 SP4 CU3
--3355 SP2 CU16
--3356 SP2 CU17