Help Center/ Distributed Database Middleware/ User Guide/ SQL Syntax/ Database Management Syntax
Updated on 2022-09-16 GMT+08:00
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Database Management Syntax

Supported Database Management Syntax

  • SHOW Syntax
  • SHOW COLUMNS Syntax
  • SHOW CREATE TABLE Syntax
  • SHOW TABLE STATUS Syntax
  • SHOW TABLES Syntax
  • SHOW DATABASES

    If the required database is not found, check fine-grained permissions of your account.

  • SHOW INDEX FROM
  • SHOW VARIABLES Syntax

Supported Database Tool Commands

  • DESC Syntax
  • USE Syntax
  • EXPLAIN Syntax

    Unlike EXPLAIN in MySQL, the output of DDM EXPLAIN describes the nodes that the current SQL statement is routed to.

Unsupported Database Management Syntax

Table 1 Restrictions on database management statements

Item

Restriction

Database management statements
  • Executing SET Syntax to modify global variables is not supported.
  • SHOW TRIGGERS is not supported.

The following SHOW statements are randomly sent to a database shard. If database shards are on different RDS for MySQL instances, the returned variables or table information may be different.

  • SHOW TABLE STATUS
  • SHOW VARIABLES Syntax
  • CHECK TABLE does not support sharding tables by hash or sharding key.
  • SHOW WARNINGS Syntax does not support the combination of LIMIT and COUNT.
  • SHOW ERRORS Syntax does not support the combination of LIMIT and COUNT.
Parent topic: SQL Syntax