Find the number of columns in a table

Question

It is possible to find the number of rows in a table:

select count(*) from tablename

Is it possible to find the number of columns in a tabl

Answer 1

Well I tried Nathan Koop's answer and it didn't work for me. I changed it to the following and it did work:

SELECT COUNT(*)
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_name = 'table_name'

It also didn't work if I put USE 'database_name' nor WHERE table_catalog = 'database_name' AND table_name' = 'table_name'. I actually will be happy to know why.

Answer 2

SELECT COUNT(*) 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE 
   TABLE_NAME = 'table_name';

Answer 3

Following query finds how columns in table:-

 SELECT COUNT(COLUMN_NAME) FROM USER_TAB_COLUMNS
 WHERE TABLE_NAME = 'TableName';

Answer 4

SELECT TABLE_SCHEMA
    , TABLE_NAME
    , number = COUNT(*) 
FROM INFORMATION_SCHEMA.COLUMNS
GROUP BY TABLE_SCHEMA, TABLE_NAME;

This one worked for me.

Answer 5

Since all answers are using COUNT(), you can also use MAX() to get the number of columns in a specific table as

SELECT MAX(ORDINAL_POSITION) NumberOfColumnsInTable
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_CATALOG = 'YourDatabaseNameHere'
      AND 
      TABLE_SCHEMA = 'YourSchemaNameHere'
      AND
      TABLE_NAME = 'YourTableNameHere';

See The INFORMATION_SCHEMA COLUMNS Table

Answer 6

SELECT count(*)
FROM information_schema.columns
WHERE table_name = 'Your_table_name';

Note: Your_table_name should be replaced by your actual table name