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* CLICKHOUSE-4063: less manual html @ index.md * CLICKHOUSE-4063: recommend markdown="1" in README.md * CLICKHOUSE-4003: manually purge custom.css for now * CLICKHOUSE-4064: expand <details> before any print (including to pdf) * CLICKHOUSE-3927: rearrange interfaces/formats.md a bit * CLICKHOUSE-3306: add few http headers * Remove copy-paste introduced in #3392 * Hopefully better chinese fonts #3392 * get rid of tabs @ custom.css * Apply comments and patch from #3384 * Add jdbc.md to ToC and some translation, though it still looks badly incomplete * minor punctuation * Add some backlinks to official website from mirrors that just blindly take markdown sources * Do not make fonts extra light * find . -name '*.md' -type f | xargs -I{} perl -pi -e 's//g' {} * find . -name '*.md' -type f | xargs -I{} perl -pi -e 's/ sql/g' {} * Remove outdated stuff from roadmap.md * Not so light font on front page too * Refactor Chinese formats.md to match recent changes in other languages
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Mathematical functions
All the functions return a Float64 number. The accuracy of the result is close to the maximum precision possible, but the result might not coincide with the machine representable number nearest to the corresponding real number.
e()
Returns a Float64 number that is close to the number e.
pi()
Returns a Float64 number that is close to the number π.
exp(x)
Accepts a numeric argument and returns a Float64 number close to the exponent of the argument.
log(x)
Accepts a numeric argument and returns a Float64 number close to the natural logarithm of the argument.
exp2(x)
Accepts a numeric argument and returns a Float64 number close to 2 to the power of x.
log2(x)
Accepts a numeric argument and returns a Float64 number close to the binary logarithm of the argument.
exp10(x)
Accepts a numeric argument and returns a Float64 number close to 10 to the power of x.
log10(x)
Accepts a numeric argument and returns a Float64 number close to the decimal logarithm of the argument.
sqrt(x)
Accepts a numeric argument and returns a Float64 number close to the square root of the argument.
cbrt(x)
Accepts a numeric argument and returns a Float64 number close to the cubic root of the argument.
erf(x)
If 'x' is non-negative, then erf(x / σ√2) is the probability that a random variable having a normal distribution with standard deviation 'σ' takes the value that is separated from the expected value by more than 'x'.
Example (three sigma rule):
SELECT erf(3 / sqrt(2))
┌─erf(divide(3, sqrt(2)))─┐
│ 0.9973002039367398 │
└─────────────────────────┘
erfc(x)
Accepts a numeric argument and returns a Float64 number close to 1 - erf(x), but without loss of precision for large 'x' values.
lgamma(x)
The logarithm of the gamma function.
tgamma(x)
Gamma function.
sin(x)
The sine.
cos(x)
The cosine.
tan(x)
The tangent.
asin(x)
The arc sine.
acos(x)
The arc cosine.
atan(x)
The arc tangent.
pow(x, y)
Takes two numeric arguments x and y. Returns a Float64 number close to x to the power of y.