Dataset

Create dataset Alter schema set options Drop dataset

Tables

Create table Create table as select Create table like Create table copy Create table options Create external table Create temp table Alter column drop not null Alter column set options Alter column change datatype Alter table set options Alter table rename Alter table add column Alter table drop column Drop temp table Drop table Drop external table

Snapshot Tables

Create Snapshot table List of snapshots Restore snapshot table Copy to Snapshot table Drop snapshot table

Views

Create view Create Materialized view Alter view set options Alter materialized view options Drop view Drop materialized view

Routines

Create Stored Procedure Create Function Create row access policy Create table function Drop function Drop table function Drop Procedure Drop row access policy

DML

INSERT values INSERT from a table INSERT values with subquery UPDATE statement UPDATE from table MERGE Statement DELETE statement TRUNCATE table

Home » Bigquery » Tutorials » Alter table drop column

BigQuery Alter table drop column

To remove one or more columns from an existing table schema, use the Alter table drop column command

Alter table drop column example

    ALTER TABLE mydataset.mytable
      DROP COLUMN A;

Dropping multiple columns

    ALTER TABLE mydataset.mytable
      DROP COLUMN A,
      DROP COLUMN IF EXISTS B

Explanation

If there are dependent objects like views or stored procedures on the table, make sure to modify to remove the column references

Syntax reference

ALTER TABLE [[project_name.]dataset_name.]table_name
DROP COLUMN [IF EXISTS] column_name [, ...]