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#DBSCHEMA VIEWER UPDATE#
#DBSCHEMA VIEWER SOFTWARE#

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#DBSCHEMA VIEWER SOFTWARE#

Before creating the view, you can check if the query is valid by pressing Validate Query ģ.Slickplan is an easy-to-use diagram and flowchart software that lets you create professional diagrams, flowcharts, and organizational charts. In DbSchema, you can easily create views:ġ.Right-click on a layout and choose ‘Create View’ Ģ.Choose a name and fill the details for the view. To delete a row, the next statement is required: DELETE FROM view_nameįor example, we can delete from the employee_details, the employee with the name Tino: DELETE FROM employee_details To insert a row in a view, execute the next statement: INSERT INTO view_name SELECT employee_details.employee_id, employee_details.name, employee_details.address, salary.salary Let’s add the employee_id column to the employee_salary view: CREATE OR REPLACE VIEW employee_salary AS

#DBSCHEMA VIEWER UPDATE#

We can update a view by using the CREATE OR UPDATE syntax. We can use this query to add or delete fields from a certain view: CREATE OR REPLACE VIEW view_name AS

The view should have only NOT NULL values.

The view should not have any grouping, DISTINCT or JOIN clauses.

The view definition has to be simple, without any aggregate functions such as SUM, AVG, MAX, MIN, COUNT.

WHERE employee_details.name = salary.name Ī view must meet some conditions before it can be updated: SELECT employee_details_name, employee_details.address, salary.salary For this, I have to derive data from both employee_details table and salary table: CREATE VIEW employee_salary AS Now I will create a view that will include the employee name, address and salary. Now I will create a view in which I want to add only the name and address columns for the employees with an employee_id smaller than 4. Let’s consider that we have the next employee_details table in the database: employee_id The SQL syntax for creating a view from a single table goes like this: CREATE VIEW view_name AS The view can derive all the rows from a base table or just some of them, based on a certain condition.įor example, views can be useful when, due to security reasons, we want to make public only a part of the table’s data.

A view can have rows and columns, just like a real table in the database. SQL Views are virtual tables with data derived from one or more base tables.