Operators in .NET framework

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Operators
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Operators are the most basic form of data functions They include the standard mathematical operators you are familiar with (such as addition, subtraction, multiplication, division, and Boolean operators), along with some you might not be familiar with (such as cubed roots and factorials) The \do meta-command in psql displays all of the operators available in the PostgreSQL database engine You can also specify a single operator with the \do meta-command to see the format for just that operator:
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test=> \do & List of operators Schema | Name | Left arg type | Right arg type | Result type | Description + + + + + pg_catalog | & | bigint | bigint | bigint | binary and pg_catalog | & | bit | bit | bit | bitwise and
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pg_catalog | & pg_catalog | & (4 rows) test=>
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Notice that there are several entries for the Boolean AND operator, based on the input value data type It is crucial that you use the proper data types when using operators Each operator specifies a set of data types that can be used for the input, and the data type of the resulting output You must follow these rules You cannot mix and match data types, such as add a character string to an integer data type There are three basic groups of data type operators: Numeric values String values NULL values The following sections describe how to use operators within each of these data types
Using Numerical Operators
Numerical operators are used on any numeric data type, such as integer, floating-point, and even money data types They can be used anywhere within the SQL command where an expression is allowed You can even use mathematical operators in the expression within the SELECT list:
test=> select 2 + 2 as result; result 4 (1 row) test=> select (10 * 35) - (14 * 20) as output1, test-> (14 * 20) - (10 * 35) as output2; output1 | output2 + 70 | -70 (1 row) test=>
One thing you should notice in these simple examples is that if you are not using data from a table, you do not need a FROM clause when working with operators and functions The result of the function appears within the result set, just as with a SELECT statement that queries tables
PostgreSQL 8 for Windows
While these are cute examples, in real life they are not too practical A common use for operators is within the UPDATE command to update values in the table For example, if you need to increase the price of all the products in the store by 3 percent, you would do the following:
test=> update store"Product" set "UnitPrice" = "UnitPrice" * 103; UPDATE 2 test=> select * from store"Product"; ProductID | ProductName | Model | Manufacturer | UnitPrice | Inventory + + + + + DES001 | Desktop | Standard | Acme | $30900 | 25 LAP001 | Laptop | Takealong | Acme | $51500 | 10 (2 rows) test=>
Since no WHERE clause was specified, the expression within the UPDATE command changed the UnitPrice data values in all records in the table Notice that you can use column names within the expressions as well as constant values This provides for a wealth of possibilities for manipulating data within the tables using SQL commands, without having to write any separate code in your application! Besides the standard numerical operators, PostgreSQL also provides a few operators that you might not be familiar with A complete list of numerical operators supported in PostgreSQL is shown in Table 8-1
Using String Operators
Unfortunately, PostgreSQL does not allow you to use the standard numerical operators on strings, such as adding or subtracting strings However, there are two types of operators that PostgreSQL does provide for your use: String concatenation operator String comparison operators The concatenation operator (||) allows you to splice multiple string values together into a single string value:
test=> select "LastName" || ', ' || "FirstName" as "Customer" test-> from store"Customer"; Customer Blum, Jessica Blum, Rich Blum, Barbara Blum, Katie (4 rows) test=>
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