In Oracle Database, the TRUNC(number) function returns a given number, truncated to a given number of decimal places.
Oracle also has a TRUNC(date) function, which is used on dates. This article is solely about the TRUNC(number) function, which is used on numbers.
In Oracle, the SIGN() function returns the sign of its argument as -1, 0, or 1, depending on whether the argument is negative, zero, or positive, and also depending on whether the argument is of type NUMBER or a floating-point number.
In Oracle, the TANH() function returns the hyperbolic tangent of its argument.
In Oracle, the TAN() function returns the tangent of its argument, where the argument is an angle expressed in radians.
In Oracle, the NANVL() function allows us to deal with NaN values by specifying another number to return in its place.
The way it works is, it accepts two arguments. If the first argument is NaN (not a number), it returns the second argument. If the first argument is a number, then it simply returns that number.
Note that this function is useful only for floating-point numbers of type BINARY_FLOAT or BINARY_DOUBLE.
In Oracle, the SQRT() function returns the square root of its argument.
In Oracle, the REPLACE() function allows you to replace a part of a string with another string.
The function accepts three arguments: the string, the substring to replace, and the replacement string (to replace the substring with).
You can omit the replacement string, in which case, the function will remove all instances of the substring.
In Oracle, the LOWER() function returns its argument with all letters in lowercase.
In Oracle, the UPPER() function returns its argument with all letters in uppercase.
In Oracle, the NLS_INITCAP() function returns its argument with the first letter of each word in uppercase, and all other letters in lowercase.
However, the actual capitalisation will depend on the collation being used. For example, it could result in more than the first letter being capitalised.
It’s similar to the INITCAP() function, except that it accepts a second argument that allows you to specify the collation. The collation handles special linguistic requirements for case conversions.Â