postgresql 如何防止CREATE TABLE IF NOT EXISTS失败与duplicate_table？IF NOT EXISTS是用来处理幂等性的...
Server: Msg 2601, Level 14, State 1, Line 1 Cannot insert duplicate key row in object 'UnitMeasure' with unique index 'AK_UnitMeasure_Name'. The statement has been terminated. F. 使用 IGNORE_DUP_KEY 选项 以下示例首先在该选项设置为 IGNORE_DUP_KEY 时在临时表中插入多行,然后在该选项设置...
In MSTVFs, @return_variable is a TABLE variable, used to store and accumulate the rows that should be returned as the value of the function. @ return_variable can be specified only for Transact-SQL functions and not for CLR functions. select_stmt The single SELECT statement that defines the...
insert...on duplicate key update column=value[,column=value]... 代码语言:javascript 代码运行次数:0 运行 AI代码解释 mysql>insert studentsvalues(31,444,'狄仁杰',56789)->on duplicate key update id=30,sn=555,name='狄仁杰',qq=56789;QueryOK,2rowsaffected(0.00sec)mysql>insert studentsvalues(31,...
Cannot insert duplicate key row in object 'UnitMeasure' with unique index 'AK_UnitMeasure_Name'. The statement has been terminated. D. 使用 IGNORE_DUP_KEY 选项 以下示例首先在该选项设置为 ON 时在临时表中插入多行,然后在该选项设置为 OFF 时执行相同操作,以演示 IGNORE_DUP_KEY 选项的影响。单个...
Specifies the error response when an insert operation attempts to insert duplicate key values into a unique index. The IGNORE_DUP_KEY option applies only to insert operations after the index is created or rebuilt. The option has no effect when executing CREATE INDEX, ALTER INDEX, or UPDATE. Th...
When CYCLE is in effect, duplicate values can be generated by DB2 for an identity column. However, if a unique index exists on the identity column and a non-unique value is generated for it, an error occurs. CACHE integer-constant or NO CACHE Specifies whether to keep some preallocated val...
Specifies the error response when an insert operation attempts to insert duplicate key values into a unique index. The IGNORE_DUP_KEY option applies only to insert operations after the index is created or rebuilt. The option has no effect when executing CREATE INDEX, ALTER INDEX, or UPDATE. Th...
A duplicate symbol results in an error. See also the discussion about length limits of generated constraint identifiers at Section 9.2.1, “Identifier Length Limits”. Note If the CONSTRAINT symbol clause is not given in a foreign key definition, or a symbol is not included following the ...
When you create a unique index, you can set an option to ignore duplicate keys. If this option is set toYesand you attempt to create duplicate keys by adding data that affects multiple rows (with the INSERT statement), the row containing a duplicate is not added. If it is set toNo, ...