The EXISTS operator returns true if the subquery returns one or more records. Here is another alternate script for the same. Code Behind - c#. PHP; MySQL Server; 6 Comments. The EXISTS operator is used to test for the existence of any record in a subquery. Ask Question Asked 3 years, 3 … Any solution you guys have come by would be great. You want to check if column exist in table Orders. -- this is the scenario I want to achieve. The EXISTS operator terminates the query processing immediately once it finds a row, therefore, you can leverage this feature of the EXISTS operator to improve the query performance.. SQL EXISTS operator example. It is very common for DBA to use above script when they want to add a new column with the script to any table. 1 Solution. Active 1 year, 8 months ago. But you can fake it, at least in MySQL 5 or later, by querying the database meta-data do see if the column exists, and drop it if it does. The SQL EXISTS Operator. In C# code I used this syntax like below. Ask Question Asked 3 years, 3 months ago. Thread • To check if column exists before adding to table oe-ander: 7 Mar • RE: To check if column exists before adding to table Roger Baklund: 7 Mar If exist, then do this else do that. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, ... Magento : How to Check if Mysql Column Exists? Viewed 22k times 5. 6,642 Views. As in title, I need a php script checking if column exists in table. The reason is that the EXISTS operator works based on the “at least found” principle. Hi Experts! Zado asked on 2012-04-10. Stack Exchange Network. Check for an existing column, if it exists we dont do anything, else we create the column. Hello, I'm sure this is a very standard problem but I can't get my query right. ALTER TABLE Task ADD Name varchar(200); thats the code that causes the problem because its trying to add an existing column. I have a procedure that should check if a record exists or not for particular date range, if exists then fetch the record else fetch last 20 record. Otherwise, it returns false. How can I add column to table only if column does not exist? Questions: Is there a way to check if a table exists without selecting and checking values from it? Solution MySQL Syntax SHOW COLUMNS FROM eComm.Orders LIKE 'BaseOrderGrandTotal'. IF COL_LENGTH('Person.Address', 'AddressID') IS NOT NULL PRINT 'Column Exists' ELSE PRINT 'Column doesn''t Exists' Well, that is the answer of this question. The EXISTS operator returns true if the subquery contains any rows. Thanks for any help. Check if column exists in mysql table with php. I need to check if a row exists, and update it if it does, or insert it if it doesn't. Best way to check if record exists or not in MySQL. For some reason, the same facility does not exist in MySQL for dropping a column if it exists. 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