fix sql ddl syntax

[legendtkl]

What is the purpose of the change

for issue: #1852

Brief change log

• monor change

Verifying this change

This change added and can be verified as follows:

• config db 5.7.x
• deploy manually

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): ( no)
• Anything that affects deployment: ( no )
• The MGS(Microservice Governance Services), i.e., Spring Cloud Gateway, OpenFeign, Eureka.: ( no)

Documentation

• Does this pull request introduce a new feature? ( no)
• If yes, how is the feature documented? (not applicable )

[peacewong]

LGTM.