Αποτελέσματα Αναζήτησης
22 Φεβ 2017 · Using Exists statement to delete data from table: IF EXISTS(SELECT 1 FROM Your_table WHERE user_id = user_id) BEGIN DELETE FROM Your_table WHERE user_id= user_id END Delete table from database : IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'TheSchema' AND TABLE_NAME = 'TheTable') BEGIN --Your delete statement END
22 Αυγ 2016 · Create new database object. The new DROP IF EXISTS syntax replaces the old block of code that used system catalog views to determine the existence of an object. Basically, the new syntax combines steps one and two into a smaller set of code to produce the same results.
10 Οκτ 2011 · I have the following SQL query in my Ruby app: sql = "DELETE FROM `#{database}`.`table1` WHERE `same_id` = #{some_id};" The problem is that in rare circumstances table1 might not exist. I need to construct this query so even if the table does not exist SQL does not throw an error.
To remove an existing database from a SQL Server instance, you use the DROP DATABASE statement. The DROP DATABASE statement allows you to delete one or more databases with the following syntax: DROP DATABASE [ IF EXISTS ] database_name [,database_name2,...];
16 Ιαν 2015 · In SQL Server you could do something like this. IF EXISTS ( SELECT 1. FROM sys.objects AS o.
30 Σεπ 2017 · The only reason I can think of using the if exists method is if there are UPDATE/DELETE triggers in the table that you want to avoid being fired, especially if you have INSTEAD OF triggers which can take some action before any update or delete is actually attempted.
19 Οκτ 2009 · Oftentimes, one wants to delete some records from a table based on criteria in another table. How do you delete from one of those tables without removing the records in both table?
