Change count columns to nullable in school_stats_by_years #18477
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The data for these columns are in separate data files which may not contain data for all school entries, and those specific data files are not always available year over year, in this case a more appropriate value would be
null
rather than0
. Also, in some cases the data in the schools directory file is set to-1
, a more appropriate value here might also benull
.Related to: #17791