我尝试为h2中的列删除唯一约束,以前创建为info varchar(255)unique.
我试过了：
sql> alter table public_partner drop constraint (select distinct unique_index_name from in formation_schema.constraints where table_name='PUBLIC_PARTNER' and column_list='INFO');
但没有成功(如下)：
Syntax error in sql statement "ALTER TABLE PUBLIC_PARTNER DROP CONSTRAINT ([*]SELECT DISTI NCT UNIQUE_INDEX_NAME FROM INFORMATION_SCHEMA.CONSTRAINTS WHERE TABLE_NAME='PUBLIC_PARTNER ' AND COLUMN_LIST='INFO') "; expected "identifier"; sql statement: alter table public_partner drop constraint (select distinct unique_index_name from informa tion_schema.constraints where table_name='PUBLIC_PARTNER' and column_list='INFO') [42001-1 60]
如何正确删除此约束？
顺便说说：
sql> (select unique_index_name from information_schema.constraints where table_name='PUBLI C_PARTNER' and column_list='INFO'); UNIQUE_INDEX_NAME CONSTRAINT_F574_INDEX_9 (1 row,0 ms)
似乎返回正确的输出.
