test=> select round(random() * 40) + 10; column 23 (1 row) test=> in VS .NET

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test=> select round(random() * 40) + 10; column 23 (1 row) test=>
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By multiplying the random number times 40, you are producing a random floatingpoint number between 0 and 40 The round() function is used to round the result to the nearest integer value Adding 10 makes the range go from 10 (if the random number was 0) through 50 (if the random number was 1)
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The functions covered so far in this chapter work on a single value within a record Often there are times when you need to extract information based on the data contained in all of the records in a table An aggregate function is a function that PostgreSQL performs on all values contained within a specified column for all records
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Math Function abs(x) acos(x) asin(x) atan(x) atan2(x, y) cbrt(x) ceil(x) ceiling(x) cos(x) cot(x) Degrees(x) exp(x) floor(x) ln(x) log(x) log(b, x) mod(x, y) pi() power(x, y) Radians(x) Random() round(x) round(x, d) Setseed(x) sign(x) sin(x) sqrt(x) tan(x) trunc(x) trunc(x, d) width_bucket (x, count, b1, b2)
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Description Return the absolute value of x Return the arc cosine of x Return the arc sine of x Return the arc tangent of x Return the arc tangent of x / y Return the cube root of x Return the smallest integer not less than x Same as ceil() Return the cosine of x Return the cotangent of x Convert x radians to degrees Return the exponential of x Return the largest integer not greater than x Return the natural logarithm of x Return the base10 logarithm of x Return the baseb logarithm of x Return the remainder of x / y Return the pi constant as a double-precision value Return x raised to the y power Convert x degrees to radians Return a random value between 00 and 10 Round x to the nearest integer Round x to d decimal places Set a double-precision seed number for the random-number generator Return -1 for negative values of x, and +1 for positive values of x Return the sine of x Return the square root of x Return the tangent of x Truncate x toward zero Truncate x to d decimal places toward zero Return the histogram bucket that the value x would be assigned to, using count buckets, with lower bound b1 and upper bound b2
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These functions are helpful when you need to perform a statistical analysis of data contained within a table Instead of having to read every record in the table and perform calculations within your application, the PostgreSQL aggregate functions can produce the statistical results automatically for you (and usually much quicker) The aggregate functions supported in PostgreSQL are listed and described in Table 8-9 These functions are used within the SELECT list portion of the SELECT SQL command and are displayed in the result set as a separate column, similar to the other functions:
test=> select * from store"Order"; CustomerID | ProductID | Quantity | TotalCost | OrderID + + + + BLU001 | LAP001 | 10 | $5,00000 | ORD001 BLU002 | LAP001 | 2 | $1,00000 | ORD002 BLU003 | DES001 | 1 | $30000 | ORD003 BLU001 | LAP001 | 2 | $1,00000 | ORD004 (4 rows) test=> select sum("TotalCost") from store"Order"; sum $7,30000 (1 row) test=>
Aggregate Function avg(expression) bit_and(expression) bit_or(expression) bool_and(expression) bool_or(expression) count(expression) every(expression) max(expression) min(expression) stddev(expression) sum(expression) Variance(expression)
Description Return the average of all values matching expression Return the bitwise AND of all values matching expression Return the bitwise OR of all values matching expression Return TRUE if all values matching expression are true Return TRUE if any value matching expression is true Return the number of records matching expression Return TRUE if all values matching expression are true Return the maximum value matching expression Return the minimum value matching expression Return the standard deviation of values matching expression Return the sum of all values matching expression Return the variance of the values matching expression
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