1 queries executed, 0 success, 1 errors, 0 warnings 查询:create table emp( id int(8) primary key not null, ename varchar(20) not null, eage int(3), esex varchar(2) ) 错误代码: 1050 Table 'emp' already exists 执行耗时 : 0 sec 传送时间 : 0 sec 总耗时 : 0.001 sec 1. 2. 3....
1 queries executed, 0 success, 1 errors, 0 warnings 查询:create table emp( id int(8) primary key not null, ename varchar(20) not null, eage int(3), esex varchar(2) ) 错误代码: 1050 Table 'emp' already exists 执行耗时 : 0 sec 传送时间 : 0 sec 总耗时 : 0.001 sec 2、错误原因...
如果不加IF NOT EXISTS,那么如果要创建的表已经存在时,系统就会报错表示已经存在此表。 例如,已经存在emp表,执行:create table emp( id int(2)) ; 结果报错:ERROR 1050 (42S01): Table 'emp' already exists(意思是:emp表已经存在。) 而加了之后,即使表名已存在也不会报错,也会“执行”,但不会创建新的...
ON UPDATE CASCADE cannot be defined if an INSTEAD OF trigger ON UPDATE already exists on the table that is being altered. For example, in the AdventureWorks database, theProductVendortable has a referential relationship with theVendortable:ProductVendor.VendorIDforeign key references theVendor.Vendor...
CONSTRAINT CK_emp_id CHECK ( emp_id LIKE '[A-Z][A-Z][A-Z][1-9][0-9][0-9][0-9][0-9][FM]' OR emp_id LIKE '[A-Z]-[A-Z][1-9][0-9][0-9][0-9][0-9][FM]' ) This example specifies that the values must be within a specific list or follow a specified patte...
ERROR: relation"table_name"alreadyexists 解决方法是使用IF NOT EXISTS选项来避免错误: CREATETABLEIFNOTEXISTStable_name(column1 datatype[constraints],...); 6.2 数据类型不匹配 在插入数据时,如果数据类型不匹配,可能会遇到错误。确保插入的数据类型与表的定义匹配。
See Also: CREATE TABLEfor information on creating tables Oracle Text Referencefor information onALTERTABLEstatements in conjunction with Oracle Text Additional Topics: Prerequisites Syntax Semantics Examples Prerequisites The table must be in your own schema, or you must haveALTERobject privilege on the ...
CHECK ( emp_id IN ('1389', '0736', '0877', '1622', '1756') OR emp_id LIKE '99[0-9][0-9]' ) F. Show the complete table definition The following example shows the complete table definitions with all constraint definitions for table PurchaseOrderDetail created in the AdventureWorks20...
If a definition for the table exists and table-name is not a system object name, table-name can be changed to provide a new name for the table. This option is ignored if a definition for the table does not exist at the current server. table-name Names the table. The name, including...
ERROR: relation "table_name" alreadyexists 解决方法是使用IF NOT EXISTS选项来避免错误: CREATETABLEIFNOTEXISTStable_name ( column1 datatype [constraints], ... ); 6.2 数据类型不匹配 在插入数据时,如果数据类型不匹配,可能会遇到错误。确保插入的数据类型与表的定义匹配。