# Accuracer: The First And Only BDE Alternative Client-Server Single-File Embedded Database for Delphi / C++Builder / Kylix

 Operators Previous  Top  Next

Introduction

Accuracer SQL supports these operator categories:
 · Arithmetic operators
 · Comparison operators
 · Logical operators
 · String concatenation operator

Arithmetic Operators

Arithmetic operators perform mathematical operations on two expressions of any of the data types of the numeric data type category.

 Operator Meaning + (Add) Addition - (Subtract) Subtraction * (Multiply) Multiplication / (Divide) Division

Example:

SELECT  (Price * Quantity) AS Total
FROM  Order

Comparison Operators

Comparison operators test whether or not two expressions are the same. Comparison operators can be used on all expressions except expressions of the
BLOB, Memo, FmtMemo or Graphic data types.

 Operator Meaning = Equal to > Greater than < Less than >= Greater than or equal to <= Less than or equal to <> Not equal to

The result of a comparison operator has the Boolean data type, which has three values: TRUE, FALSE, and UNKNOWN. Expressions that return a Boolean data type are known as Boolean expressions.
If an operator that has one or two NULL expressions returns UNKNOWN.
Expressions with Boolean data types are used in the WHERE clause to filter the rows that qualify for the search conditions

Example:

SELECT  *
FROM Orders
WHERE (TaxRate > 0)

Logical Operators

Logical operators test for the truth of some condition. Logical operators, like comparison operators, return a Boolean data type with a value of TRUE or FALSE.

 Operator Meaning AND TRUE if both Boolean expressions are TRUE. BETWEEN TRUE if the operand is within a range. IN TRUE if the operand is equal to one of a list of expressions. LIKE TRUE if the operand matches a pattern. NOT Reverses the value of any other Boolean operator. OR TRUE if either Boolean expression is TRUE. IS NULL TRUE if Boolean expression is UNKNOWN

Examples:

SELECT  *
FROM Customer
WHERE (Company LIKE '%Club%')

SELECT  *

FROM Orders
WHERE (ShipToCity IS NOT NULL)

SELECT  *

FROM Orders
WHERE (TaxRate BETWEEN 0 and 5) AND (AmountPaid > 1)

SELECT  *

FROM Orders
WHERE (ShipVIA IN ('UPS', 'DHL'))

String Concatenation Operator

The string concatenation operator allows string concatenation with the addition sign (+) or concatenation sign (||), which is also known as the string concatenation operator.

Example:

SELECT  (FirstName + ' ' + LastName)  AS  Name
FROM Customers

 © AidAim Software Accuracer: Client Server Single-file Bde Replacement Delphi Database Embedded Databas