ERROR 1061 (42000): Duplicate key name 'cm_article_contents' Please let me know what can be wrong. SQLS TO EXECUTE: === create parent 1: === create table cm_articles ( article_id bigint not null, article_type_id bigint not null, title...
9.1.4.1 Adding Foreign Key Relationships Using an EER Diagram 9.1.4.2 The Relationship Editor 9.1.4.3 Connection Properties Foreign key constraints are supported for theInnoDBstorage engine only. For other storage engines, the foreign key syntax is correctly parsed but not implemented. For more inform...
4,foreign key 外键,表某列的值匹配其他表列的值。 5,check ,要求值满足指定的条件。CHECK (EMPLOYEE_AGE >= 18)。 6,ref,描述列和表的关系。 Adding Constraints to Existing Tables altertabletablename modify(修饰) columnname notnull;altertabletablenameaddconstraint(约束) pk_nameprimarykey(columnname)...
The ALTER TABLE ADD CONSTRAINT statement is the only DDL context where theNOVALIDATEkeyword is valid when a foreign-key constraint is being created. You cannot, for example, create a foreign-key constraint in a NOVALIDATE mode in any of the following SQL statements: CREATE TABLE statements CREATE...
For details, see the syntax CREATE FOREIGN TABLE (SQL on Hadoop or OBS). 1 2 3 4 5 6 7 8 9 10 CREATE FOREIGN TABLE [ IF NOT EXISTS ] table_name ( [ { column_name type_name [ { [CONSTRAINT constraint_name] NULL | [CONSTRAINT constraint_name] NOT NULL | column_constraint [....
Delete a FOREIGN KEY constraint to remove the requirement for referential integrity between the foreign key columns and the related primary key, or UNIQUE constraint, columns in another table. To create a FOREIGN KEY constraint when you create a table CREATE TABLE (Transact-SQL) To create a FORE...
Next, you will create the MARTS.ORDER_FACT table and create relationships between the tables by using foreign key constraints. Creating the MARTS.ORDER_FACT table and adding foreign-key constraints You need to create a MARTS.ORDER_FACT table and add foreign-key constraints between the other ...
To use Huawei Cloud GaussDB(DWS), create a data warehouse cluster first.This section describes how to create a data warehouse cluster on the GaussDB(DWS) console.To balan
Foreign Keys Pane Specifies one or more foreign keys for the table. A foreign key specifies a column ("local column"), whose data values match values in the primary key or unique constraint of another table. Name: Name of the foreign key definition. ...
There is one big downside to mixing engine types. Foreign keys (used to enforce referential integrity, as explained inChapter 1, "Understanding SQL") cannot span engines. That is, a table using one engine cannot have a foreign key referring to a table that uses another engine. ...