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Maybe something like this,
wd=10

awk -v wd="$wd" -F: '$NF=$NF-wd' OFS=: file > temp && mv temp file
Try it first on some test files.

If the blank line between CREATE TABLE paragraphs is always present this should suffice:

awk '/CREATE TABLE/{ n++; print > (f="out_" n); close(f)}' RS= sql_file

Otherwise use,

awk...