Αποτελέσματα Αναζήτησης
DROP COLUMN. The DROP COLUMN command is used to delete a column in an existing table. The following SQL deletes the "ContactName" column from the "Customers" table:
Oracle Drop Column using DROP COLUMN clause. To drop a column from a table physically, you use the following statement: ALTER TABLE table_name DROP COLUMN column_name; Code language: SQL (Structured Query Language) (sql) To drop multiple columns, you use the statement below: ALTER TABLE table_name DROP ( column_name_1, column_name_2 ); Code ...
Single-Table Syntax. DELETE [LOW_PRIORITY] [QUICK] [IGNORE] FROM tbl_name [[AS] tbl_alias] [PARTITION (partition_name [, partition_name] ...)] [WHERE where_condition] [ORDER BY ...] [LIMIT row_count] The DELETE statement deletes rows from tbl_name and returns the number of deleted rows.
20 Δεκ 2012 · To delete a single column: ALTER TABLE `table1` DROP `column1`; To delete multiple columns: ALTER TABLE `table1` DROP `column1`, DROP `column2`, DROP `column3`;
19 Σεπ 2023 · Here is the generic SQL syntax to delete a column: 1 ALTER TABLE table_name DROP COLUMN column_name; Where: table_name is the name of the table you want to remove the column_name column from; column_name is the name of the column to remove.
Physical Delete. To physically drop a column you can use one of the following syntaxes, depending on whether you wish to drop a single or multiple columns. alter table table_name drop column column_name; alter table table_name drop (column_name1, column_name2);
15.2.2 DELETE Statement. DELETE is a DML statement that removes rows from a table. A DELETE statement can start with a WITH clause to define common table expressions accessible within the DELETE. See Section 15.2.20, “WITH (Common Table Expressions)”.
