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25.39.10 The INFORMATION_SCHEMA INNODB_FIELDS Table

Contents

The INNODB_FIELDS table provides metadata about the key columns (fields) of InnoDB indexes.

For related usage information and examples, see Section 15.14.3, “InnoDB INFORMATION_SCHEMA Schema Object Tables”.

The INNODB_FIELDS table has these columns:

  • INDEX_ID

    An identifier for the index associated with this key field; the same value as INNODB_INDEXES.INDEX_ID.

  • NAME

    The name of the original column from the table; the same value as INNODB_COLUMNS.NAME.

  • POS

    The ordinal position of the key field within the index, starting from 0 and incrementing sequentially. When a column is dropped, the remaining columns are reordered so that the sequence has no gaps.

Example

  1. mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_FIELDS WHERE INDEX_ID = 117\G
  2. *************************** 1. row ***************************
  3. INDEX_ID: 117
  4.     NAME: col1
  5.      POS: 0

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Notes

  • You must have the PROCESS privilege to query this table.

  • Use the INFORMATION_SCHEMA COLUMNS table or the SHOW COLUMNS statement to view additional information about the columns of this table, including data types and default values.


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