Can I update view in MySQL?
You can update view in MySQL using ALTER statement. This will replace the SQL query for view, not underlying data.
How do I display information in MySQL?
The first command you will need to use is the SELECT FROM MySQL statement that has the following syntax: SELECT * FROM table_name; This is a basic MySQL query which will tell the script to select all the records from the table_name table.
How can I tell when a MySQL database was last updated?
In MySQL’s latest version you can use the information_schema database if another table is already updated like this:
- SELECT UPDATE_TIME.
- FROM information_schema.tables.
- WHERE TABLE_SCHEMA = ‘dbname’
- AND TABLE_NAME = ‘tabname’
How do I view metadata in MySQL?
To obtain metadata about views:
- Query the VIEWS table of the INFORMATION_SCHEMA database. See Section 24.3. 31, “The INFORMATION_SCHEMA VIEWS Table”.
- Use the SHOW CREATE VIEW statement. See Section 13.7. 5.13, “SHOW CREATE VIEW Statement”.
Can you update views?
yes it is possible to insert,Update and delete using views. Mostly it is used to show limited data to user not whole table. View is a virtual table which is created when invoked. Yes we can update, delete the view.
Can I insert into a view?
You can insert rows into a view only if the view is modifiable and contains no derived columns. The reason for the second restriction is that an inserted row must provide values for all columns, but the database server cannot tell how to distribute an inserted value through an expression.
How do you display records in SQL?
The SQL SELECT Statement
- SELECT column1, column2, FROM table_name;
- SELECT * FROM table_name;
- Example. SELECT CustomerName, City FROM Customers;
- Example. SELECT * FROM Customers;
How can I tell when my DB was updated?
2 Answers. You can check if the user exists (SELECT * FROM members WHERE user = :user) before you make the update request. If you want to do it without checking if the user exists, use $stmt->rowCount() after $stmt->execute(…) in order to really determine how many records has been changed.
How do I find the last updated column in MySQL?
Then each time that you make an UPDATE query you would do an INSERT query to the history table. i have created a trigger but need a sub query like this( select LAST(COLUMN_NAME) from Table_Name; ) to get a particular updated column name witch is updated recently.
How do I view database metadata?
MySQL provides several ways to obtain database metadata—that is, information about databases and the objects in them:
- SHOW statements such as SHOW DATABASES or SHOW TABLES.
- Tables in the INFORMATION_SCHEMA database.
- Command-line programs such as mysqlshow or mysqldump.
How do I find metadata in SQL Server?
There are 2 simple ways:
- Option 1. sp_help ‘schema.table_name’
- Option 2. SELECT * FROM INFORMATION_SCHEMA.columns c WHERE c.table_name = ‘table_name’