How do I calculate the number of columns in a table without using the "DESCRIBE tablename"?
For this one, you can use one of the catalog views, ALL_TAB_COLUMNS. Each row in this view represents a column of a table or view to which you have rights. To illustrate, we'll create a dummy table, and then select a count from the ALL_TAB_COLUMNS view.
create table "ATE"."DUMMY_TABLE" ( dummycol1 numeric(10), dummycol2 varchar(4), dummycol3 date ); select count(*) from all_tab_columns where owner = 'ATE' and table_name = 'DUMMY_TABLE';
Here is the result of the query.
COUNT(*) ---------- 3
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