Αποτελέσματα Αναζήτησης
2 Αυγ 2016 · If you want to use the DAO TableDef methods to drop your field, use Database.TableDefs(tableName).Fields.Delete fieldToDrop, as @Lokusking suggested. However I think it's easier to just execute a DDL ALTER TABLE statement to drop the field:
alter table table_name drop column column_name; alter table table_name drop (column_name1, column_name2); Dropping a column from a table will cause all unused columns in that table to be dropped at the same time.
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:
10 Σεπ 2002 · I am trying to drop an unused column from a table. Why would I see a record in USER_UNUSED_COL_TABS, even after executing ALTER TABLE SK_20120402 DROP UNUSED COLUMNS; The script I used : SQL> DROP TABLE sk_20120402; Table dropped.
The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table. ALTER TABLE - ADD Column
Setting the newly added columns to Unused. ALTER TABLE JOBS_TEMP SET UNUSED (DUMMY1, DUMMY2)
Dropping multiple columns using alter table. ALTER TABLE JOBS_Temp DROP (BONUS, COMMISSION)
