sql server - SQL - select data that have dates greater than a month in a year -

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i have table called quiz , has 3 columns:

enteryear  entermonth  quizmark  2013        7            9.5    2013        8            8.5     2013        9            9.75     2013       10            10     2013       11            7.75     2013       12            8.5 2014        1            5    2014        2            8.75     2014        3            10

now, want select entries enter after sept. of 2013 (including sept). tried wrong:

select * quiz q q.year>=2013 , q.month>=9

this omitted entries in 2014 since months less 9, want them in result since after sept. of 2013.

so then, tried this

select * quiz q  convert(date, cast(q.year varchar(4))+'/'+cast(q.month varchar(2))+'/01')>='2013/9/01'

which showed result half second , disappeared giving error message:

msg 241, level 16, state 1, line 1 conversion failed when converting date and/or time character string."

can correct code achieve result, appreciated!

select * quiz q q.year>2013 or(q.year=2013 , q.month>=9)

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