整合sqlite扩展函数:(sqlite3.dll,sqlite3cmd)
Math: acos, asin, atan, atn2, atan2, acosh, asinh, atanh, difference,
degrees, radians, cos, sin, tan, cot, cosh, sinh, tanh, coth, exp,
log, log10, power, sign, sqrt, square, ceil, floor, pi.
String: replicate, charindex, leftstr, rightstr, ltrim, rtrim, trim,
replace, reverse, proper, padl, padr, padc, strfilter.
Aggregate: stdev, variance, mode, median, lower_quartile,
upper_quartile.
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