Creating a query

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Creating a query

Overview

Two methods can be used to create a query:

creating the query with a wizard or with the description window, and generating the SQL code automatically.
typing the SQL code. For more details, see How to create a query in SQL code?

The query editor allows you to create several types of queries:

select query: this type of query allows you to view a selection of records from one or more files in a database. This is the most common type of query.
For more details, see How to create a select query?
insert query: this type of query is used to add records to a database file.
For more details, see How to create an insert query?
update query: this type of query is used to update the records found in a database file.
For more details, see How to create an update query?
delete query: this type of query is used to delete records from a database file.
For more details, see How to create a delete query?
combining query: this type of query is used to combine select queries.
For more details, see How to create a combining query?


	Important	Reports & Queries cannot be used to create insert queries, update queries or delete queries.

Remark: All types of queries can be based on items belonging:

to a data file described in the analysis.
a query that was previously created with the query editor.

Once the query is created, the characteristics of this query can be modified at any time. For more details, see Describing a query.

Notes

Insert query, update query and delete query:

The ability to create insert, update and delete queries is supported for compatibility with the SQL standard.

Using native WINDEV commands (HReadFirst, HReadNext, HAdd, HModify, HDelete, ... is much better suited to programming this type of process.

SQL is a query language used to interrogate data but it is not well suited for custom modifications of this data. To add, modify or delete records in a database file, the power and simplicity of WINDEV makes it the ideal and recommended solution


	Important	Reports & Queries cannot be used to create insert queries, update queries or delete queries.

Principle

To create a query, you must:

specify the method used to create the query (wizard, description window or SQL code).
specify the type of query (insert, update, ...).
specify (if necessary) the WINDEV, WINDEV Mobile or WEBDEV analysis containing the description of data files on which the query will be based.
select the items to use.
enter the characteristics of the query (selection conditions, sort, ...).