PostgreSQL Functions in .NET

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Description Addition Subtraction Multiplication Division Modulo (remainder of the division) Exponent (one value to the power of another) Square root Cube root Factorial Factorial, when used as a prefix Absolute value Boolean AND Boolean OR Boolean XOR Boolean NOT Bitwise shift left Bitwise shift right
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Table 8-1 PostgreSQL Numerical Operators
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The concatenation operator merged the two column string values along with a constant string value to produce the desired output in the result set Again, it is important to notice that the constant string value uses a single quote, and the column names use a double quote The concatenation operator is an extremely useful tool to have available when creating reports from a query The most popular type of string operators available in PostgreSQL are comparison operators Comparison operators are used to (obviously) compare string values This allows you to do such things as query a table looking for a specific name or address There are three categories of string comparison operators available in PostgreSQL: Unix-style regular expression operators The ANSI SQL LIKE operator The ANSI SQL SIMILAR TO operator
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Each type uses a slightly different method for comparing strings, as discussed in the following sections Unix-style Regular Expressions The Unix-style regular expression comparison operators provided by PostgreSQL are listed and described in Table 8-2 The first seven comparison operators compare two string values The alphabetical comparison used for strings depends on the locale setting set in the postgresqlconf configuration file (configured during the installation, as described in 2) Each of the comparison operators can be used anywhere within the expression of a SQL command:
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test=> select * from store"Order" where "OrderID" > 'ORD002'; CustomerID | ProductID | Quantity | TotalCost | OrderID + + + + BLU003 | DES001 | 1 | $30000 | ORD003 BLU001 | LAP001 | 2 | $1,00000 | ORD004 (2 rows) test=>
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Description Check if two string values are exactly identical Check if two string values are not exactly identical Check if two string values are not exactly identical Check if one string value is alphabetically greater than another Check if one string value is alphabetically less than another Check if one string value is alphabetically equal to or greater than another Check if one string value is alphabetically equal to or less than another String matches regular expression String matches regular expression without regard to case String does not match a regular expression String does not match a regular expression without regard to case
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Table 8-2 PostgreSQL String Comparison Operators
8:
PostgreSQL Functions
The greater-than string comparison operator worked as expected on the OrderID column string data It examined the string values and compared the entire string and filtered only the strings that were alphabetically greater than the ORD002 constant value (numbers in strings are still considered characters, and are compared using their encoding value such as ASCII or UTF8) The last four string comparison operators shown in Table 8-2 compare a single string value against a Unix-style regular expression Regular expressions are coded sequences of characters and symbols that allow you to specify ranges of character values to compare a string against The expression is matched against the entire data string value, and is true if the expression is found within the string value as specified by the regular expression Regular expressions use special symbols to indicate where in the string to locate characters Table 8-3 lists and describes the regular expression special symbols available Regular expressions can become quite complex (entire books have been written on how to use them) The best way to get a feel for using regular expressions is to see them in action Here is a simple example of a regular expression:
test=> select "LastName", "FirstName" from store"Customer" test-> where "FirstName" ~ '[RB]'; LastName | FirstName + Blum | Rich Blum | Barbara (2 rows) test=>
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