In PostgreSQL we can use the random_normal() function to generate a normally-distributed random number.
A normally-distributed random number is a random variable with a Gaussian distribution. This is said to be normally distributed, and is referred to as a normal deviate.
PostgreSQL has an aggregate function called array_agg() that allows us to generate an array from the result set of a query.
The function accepts an argument which is used to generate the array. This argument is typically the column that we want to use in order to populate the array.
PostgreSQL has a generate_subscripts() function that generates a series comprising the valid subscripts of a given array.
We pass the array to the function, along with the dimension that we want to use. We also have the option of returning the series in reverse order.
In PostgreSQL array_shuffle() is a system function that randomly shuffles the first dimension of a given array.
The array_shuffle() function was introduced in PostgreSQL 16, which was released on September 14th 2023.
In PostgreSQL array_sample() is a system function that returns an array of a specified number of items randomly selected from the given array.
The array_sample() function was introduced in PostgreSQL 16, which was released on September 14th 2023.
PostgreSQL 16 introduced the date_subtract() function that allows us to subtract an interval from a timestamp with time zone.
It computes times of day and daylight-savings adjustments according to the time zone named by the third argument, or the current TimeZone setting if that is omitted.
PostgreSQL 16 introduced the date_add() function that allows us to add an interval to a timestamp with time zone.
It computes times of day and daylight-savings adjustments according to the time zone named by the third argument, or the current TimeZone setting if that is omitted.
In SQL Server, we can use the GET_BIT() function to return the bit from the specified location in a value. We pass the value as either an integer or binary expression.
The function accepts two arguments; the expression, and the offset. The function then returns the bit from the given offset in the expression.
In SQL Server, the BIT_COUNT() function returns the number of bits set to 1 in the given argument, based on the binary equivalent of that argument.
Different values will have a different number of 1s in their binary value. Also, the same value can have a different number of 1s, depending on the data type.
SQL Server 2022 introduced the SET_BIT() function that sets a bit in an integer or binary value (other than a large object).
The function allows us to specify an offset for which to set a bit to 1 or 0.