A majority of well-to-do companies collect transactional data and then want to see nicely formatted reports. For instance, suppose you need a report of your company's employees' work schedules.
Different developers have their own ways of doing things and this is reflected in their coding style. What you will see here is the way I like to write my code. SQL statements can also be quite long, and for that reason they are usually assigned to text variables so that they are easier to handle.
Compare these two statements: Lastname from tblStaff where tblStaff.
Access only demands that you do this when your field names contain spaces. The brackets tell Access that all the words in the field name belong together.
They also tell Access that "this is a field name" and so allows you to use otherwise reserved words for the names of fields such as [Date] which is also the name of a function without causing conflicts.
But I do this for another reason too. This makes long statements much easier to read and edit The statement itself needs to be enclosed in quotes because it is a VBA text string. If you use the same type of quote mark for each Access will get confused.
Look at this example Compare the two examples below. The VBA sees a text string enclosed by double quotes, inside which is some more text enclosed in single quotes.
I working with multiple sets of quotes gets confusing, you can always use the ASCII character code for the double quote mark - Chr 34 - instead.
There is an example of this in the next section. Putting It All Together Some of these rules are essential, others are just my way of doing things and that of many other database developers. The illustration below shows a completed SQL statement written the way I suggest [click the thumbnail to see a full-sized image]: You might be changing the criteria, fields or even data sources specified in your SQL statements each time the code is run.
The information that the SQL statement needs is often obtained from the user through their choices in a dialog box or from the values in fields on a form.
Forthcoming tutorials in this series will show how this can be done. You want to allow the user to choose a value for the Office criteria each time the query is run, so you build a dialog box in which there is a combo box containing a list of Offices.
The combo box is named cboOffice. You can insert a reference to the value of the combo box directly into the SQL statement: Alternatively, you can place the value of the combo box into a variable and then insert the variable into the SQL statement:If you were referred to this article in answer to your question in an SQL Server forum, you should read the short version of this article first and chances are very good that the short version is all you need for the moment.
This article covers the topic in depth, and you would read it if you have. Our PL SQL certification training course lets you learn the PL SQL language for query of Oracle databases. We provide the best online training classes to help you learn the database tools, query language, subprogram, syntax query, basic and advanced DML, scripting.
String manipulations are an inherent part of any programming language. Fortunately, Microsoft SQL Server provides a number of functions that help you along the way.
A quick overview of the three core Boolean search operators and Boolean query modifiers: AND, OR, NOT, Asterisk, Parentheses, Quotation Marks. Like XML, XQuery is a case-sensitive language. Keywords in XQuery use lower-case characters and are not reserved—that is, names in XQuery expressions are allowed to be the same as language keywords, except for certain unprefixed function-names listed in A.3 Reserved Function Names.
[Definition: In the data model, a value is always a sequence.]. Creating Microsoft Access Parameter Queries: Most of the queries that you will create in Microsoft Access will have pre entered criteria in the query design grid to select a group of records.
This article will show you how to enable the database user to input criteria to be used by the query.
A parameter query is a flexible query that prompts the .