alter table column length oracle code example

Example 1: mysql get table size

SELECT
  TABLE_NAME AS `Table`,
  ROUND((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024) AS `Size (MB)`
FROM
  information_schema.TABLES
WHERE
  TABLE_SCHEMA = "bookstore"
ORDER BY
  (DATA_LENGTH + INDEX_LENGTH)
DESC;

Example 2: alter table column size oracle

ALTER TABLE tablename MODIFY fieldname VARCHAR2(100);

Example 3: sql alter column size

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

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