SELECT STATEMENT – Continued
In a ISQL select statement only SELECT and FROM statements are mandatory. Other clauses like
WHERE,GROUP BY,HAVING,ORDER BY are optional.
How to use expressions in ISQL SELECT Statement?
Expressions combine many arithmetic operators, they can be used in SELECT, WHERE and ORDER BY Clauses of the ISQL SELECT Statement.
Here we will explain how to use expressions in the SQL SELECT Statement. About using expressions in WHERE and ORDER BY clause, they will be explained in their respective sections.
The operators are evaluated in a specific order of precedence, when more than one arithmetic operator is used in an expression. The order of evaluation is: parentheses, division, multiplication, addition, and subtraction. The evaluation is performed from the left to the right of the expression.
For example: If we want to display the desc and stk_qty combined together, the ISQL Select Statement would be like
SELECT desc,” “,stk_qty from m_stock;
Output:
Desc Stk_qty
| Paint | 1000 | |
| MS Sheet | 2000 | |
| Rubber Gasket | 5000 | |
| Welding rode | 500 | |
| Cotton waste | 100 |
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