The INFORMATION_SCHEMA KEYWORDS Table For those two tables, the  KEY_COLUMN_USAGE  table has two rows: For  NDB : This value is always  NULL . The  KEYWORDS  table lists the words considered keywords by MySQL and, for each one, indicates whether it is reserved. Reserved keywords may require special treatment in some contexts, such as special quoting when used as identifiers (see Section 9.3, “Keywords and Reserved Words” ). This table provides applications a runtime source of MySQL keyword information. Prior to MySQL 8.0.13, selecting from the  KEYWORDS  table with no default database selected produced an error. (Bug #90160, Bug #27729859) The  KEYWORDS  table has these columns: The keyword. An integer indicating whether the keyword is reserved (1) or nonreserved (0). These queries lists all keywords, all reserved keywords, and all nonreserved keywords, respectively: The latter two queries are equivalent to: If you build MySQL from source, the build process generates a  keyword_list.h  header file containing an array of keywords and their reserved status. This file can be found in the  sql  directory under the build directory. This file may be useful for applications that require a static source for the keyword list. The  ndb_transid_mysql_connection_map  table provides a mapping between  NDB  transactions,  NDB transaction coordinators, and MySQL Servers attached to an NDB Cluster as API nodes. This information 4801 26.3.18 The INFORMATION_SCHEMA ndb_transid_mysql_connection_map Table 26.3.17 The INFORMATION_SCHEMA KEYWORDS Table •One row with  CONSTRAINT_NAME  =  ’PRIMARY’ ,  TABLE_NAME  =  ’t1’ ,  COLUMN_NAME  =  ’s3’ , ORDINAL_POSITION  =  1 ,  POSITION_IN_UNIQUE_CONSTRAINT  =  NULL . •One row with  CONSTRAINT_NAME  =  ’CO’ ,  TABLE_NAME  =  ’t3’ ,  COLUMN_NAME  =  ’s2’ , ORDINAL_POSITION  =  1 ,  POSITION_IN_UNIQUE_CONSTRAINT  =  1 . • WORD • RESERVED SELECT WORD FROM INFORMATION_SCHEMA.KEYWORDS WHERE RESERVED; SELECT WORD FROM INFORMATION_SCHEMA.KEYWORDS WHERE NOT RESERVED; CREATE TABLE t3 ( s1 INT, s2 INT, s3 INT, KEY(s1), CONSTRAINT CO FOREIGN KEY (s2) REFERENCES t1(s3) ) ENGINE=InnoDB; SELECT * FROM INFORMATION_SCHEMA.KEYWORDS; SELECT WORD FROM INFORMATION_SCHEMA.KEYWORDS WHERE RESERVED = 1; SELECT WORD FROM INFORMATION_SCHEMA.KEYWORDS WHERE RESERVED = 0;