[MySQL Documentation: Creating a table with a composite primary key]( [MySQL Tutorial: Composite Primary Key]( -- 示例代码CREATETABLEstudents(idINT,course_idINT,nameVARCHAR(50),PRIMARYKEY(id,course_id));INSERTINTOstudents(id,course_id,name)VALUES(1,101,'John Doe'),(1,102,'Jane Smith'),...
1. To create a composite key at the time of table creation - CREATE TABLE table1 (key1 CHAR(#), key2 CHAR(#), key3 (CHAR(#), PRIMARY KEY(key1, key2)); 2. To create a composite key after-the-fact (no primary key specified when table created) - ALTER TABLE (table...
SQL FOREIGN KEY on CREATE TABLE The following SQL creates a FOREIGN KEY on the "PersonID" column when the "Orders" table is created: 建立PersonID为外键,指向Persons表格的PersonID MySQL: CREATE TABLE Orders ( OrderID int NOT NULL, OrderNumber int NOT NULL, PersonID int, PRIMARY KEY (Order...
Bug #83082 Update failing with composite primary key Submitted: 21 Sep 2016 14:49Modified: 22 Sep 2016 7:15 Reporter: Martin Humphries Email Updates: Status: Verified Impact on me: None Category: MySQL Server: DDLSeverity: S2 (Serious) Version: 5.7.13OS: Windows (7 Ultimate SP1) ...
If you wish to create a composite primary key you can select multiple columns and check the PK check box. However, there is an additional step that is required, you must click the Indexes tab, then in the Index Columns panel you must set the desired order of the primary keys. ...
PRIMARY KEY(`firstname`, `lastname`) ) ENGINE = InnoDB; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 1)基于实体类属性的复合主键 映射文件如下: <class name="User" table="user"> <composite-id> <key-property name="Lastname" ...
CREATE[TEMPORARY]TABLE[IFNOTEXISTS]tbl_name(create_definition,...)[table_options][partition_options] create_definition:col_namecolumn_definition|[CONSTRAINT[symbol]]PRIMARYKEY[index_type](index_col_name,...)[index_option]...| {INDEX|KEY}[index_name][index_type](index_col_name,...)[index_...
CREATE TABLE creates a table with the given name. You must have the CREATE privilege for the table. By default, tables are created in the default database, using the InnoDB storage engine. An error occurs if the table exists, if there is no default database, or if the database does ...
Bug #30590 delete from memory table with composite btree primary key Submitted: 23 Aug 2007 10:26Modified: 22 Oct 2007 22:08 Reporter: Shane Bester (Platinum Quality Contributor) Email Updates: Status: Closed Impact on me: None Category: MySQL Server: Memory storage engineSeverity: S1 (...
primary key (FlightDate, AirlineID, Carrier, UniqueCarrier, FlightNum, Origin, DepTime, Dest) ) # 分区表 create table flightstats ( AirlineID int not null, UniqueCarrier char(3) not null, Carrier char(3) not null, FlightDate date not null, ...