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
The DELETE statement is used to delete existing records in a table. DELETE Syntax. DELETE FROM table_name WHERE condition; Note: Be careful when deleting records in a table! Notice the . WHERE clause in the DELETE statement. The WHERE clause specifies which record (s) should be deleted.
27 Νοε 2020 · Lets check, if the Name column does exist in table SampleTable, and if it exists then delete the column. IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = N'dbo.SampleTable' AND COLUMN_NAME = N'Name') ALTER TABLE dbo.SampleTable DROP COLUMN [NAME] As you can see, to check for the column existence in a table, system ...
Right-click the function you want to delete and select Delete. In the Delete Object dialog box, select OK. Select Show Dependencies in the Delete Object dialog box to open the function_name Dependencies dialog box.
29 Ιουλ 2022 · The syntax for a basic DELETE query includes the DELETE keyword and the table name with the schema name, which is sometimes optional depending on the database design. Also, it is important to consider including a WHERE clause.
4 Οκτ 2019 · The ANSI SQL/cross-platform way is to use the INFORMATION_SCHEMA, which was specifically designed to query meta data about objects within SQL databases. if exists (select * from INFORMATION_SCHEMA.TABLES where TABLE_NAME = 'Scores' AND TABLE_SCHEMA = 'dbo') drop table dbo.Scores;
10 Οκτ 2011 · I would test the table exists first, by running a query such as; SHOW TABLES LIKE 'table1'; And then perform the delete based on the results of that query. If the table exists, a single record is returned containing the table name.
