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The average mean value. If no rows are selected, the result is NULL. Aggregates are only allowed in select statements. The returned value is of the same data type as the parameter. The bitwise AND of all non-null values. The bitwise OR of all non-null values. Returns true if all expressions are true. Returns true if any expression is true. The count of all row, or of the non-null values. This method returns a long. If no rows are selected, the result is 0.

Concatenates strings with a separator. The default separator is a ',' without space. This method returns a string. Aggregate the value into an array. This method returns an array. The sum of all values. The data type of the returned value depends on the parameter data type like this: Estimates the selectivity of a value.

The selectivity of 0 rows is 0 unknown. Up to values are kept in memory. The population standard deviation. This method returns a double. The sample standard deviation.

The population variance square of the population standard deviation. The sample variance square of the sample standard deviation. The value separating the higher half of a values from the lower half. Returns the middle value or an interpolated value between two middle values if number of values is even. Interpolation is only supported for numeric, date, and time data types. NULL values are ignored in the calculation. See also Java Math. Please note that Math.

Calculate the arc cosine. Calculate the arc sine. Calculate the arc tangent. Calculate the trigonometric cosine. Calculate the hyperbolic cosine. Calculate the trigonometric sine. Calculate the hyperbolic sine. Calculate the trigonometric tangent. Calculate the hyperbolic tangent. Calculate the angle when converting the rectangular coordinates to polar coordinates. The bitwise AND operation.

Returns true if and only if the first parameter has a bit set in the position specified by the second parameter. This method returns a boolean. The second parameter is zero-indexed; the least significant bit has position 0.

The bitwise OR operation. See also Java operator. The bitwise XOR operation. Calling the function without parameter returns the next a pseudo random number. Calling it with an parameter seeds the session's random number generator. This method returns a double between 0 including and 1 excluding. Please note that using an index on randomly generated data will result on poor performance once there are millions of rows in a table. The reason is that the cache behavior is very bad with randomly distributed data.

This is a problem for any database system. Rounds to a number of digits, or to the nearest long if the number of digits if not set. This method returns a numeric the same type as the input. This function rounds numbers in a good way, but it is slow.

It has a special handling for numbers around 0. The value is converted to a String internally, and then the last last 4 characters are checked.

Encrypts data using a key. The supported algorithm is AES. The block size is 16 bytes. This method returns bytes. Decrypts data using a key. Calculate the hash value using an algorithm, and repeat this process for a number of iterations.

Currently, the only algorithm supported is SHA Truncates to a number of digits to the next value closer to 0. When used with a timestamp, truncates a timestamp to a date day value. When used with a date, truncates a date to a date day value less time part. When used with a timestamp as string, truncates a timestamp to a date day value.

Compresses the data using the specified compression algorithm. Compression does not always reduce size. Very small objects and objects with little redundancy may get larger. This method returns an int. Returns the number of bits in a string. Each character needs 16 bits. Returns the number of characters in a string. Returns the number of bytes in a string. Each character needs 2 bytes. Combines strings with separator. Converts a hex representation of a string to a string.

Converts a string to the hex representation. Returns the location of a search string in a string. If a start position is used, the characters before it are ignored. If position is negative, the rightmost location is returned. Please note this function is case sensitive, even if the parameters are not. Inserts a additional string into the original string at a specified start position.

The length specifies the number of characters that are removed at the start position in the original string. Left pad the string to the specified length. If the length is shorter than the string, it will be truncated at the end. If the padding string is not set, spaces will be used.

Right pad the string to the specified length. If the length is shorter than the string, it will be truncated. Removes all leading spaces, trailing spaces, or spaces at both ends, from a string. Other characters can be removed as well. Replaces each substring that matches a regular expression. For details, see the Java String. If any parameter is null except optional flagsString parameter , the result is null.