A. Using a sequence number in a single tableThe following example creates a schema named Test, a table named Orders, and a sequence named CountBy1, and then inserts rows into the table using the NEXT VALUE FOR function.SQL Másolás ...
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Sequence一个需要注意的情况是Sequence只负责生成序列号,而不管序列号如何使用,如果事务不成功或回滚,SequenceNumber仍然会继续向后生成序列号,如图7所示。 图7.Sequence仅仅负责生成序列号 我们还可以为Sequence指定缓存选项,使得减少IO,比如,我们指定Cache选项为4,则当前的Sequence由1增长过4后,SQL Server会再分配4个...
很多oracle语句在使用的时候会有限制,但是Function在大多数情况下没有限制,我们可以通过程序来获取nextval以及currval --获取序列下一个值createorreplacefunctionget_seq_next (seq_nameinvarchar2)returnnumberisseq_valnumber;beginexecuteimmediate'select'||seq_name||'.nextval from dual'intoseq_val ;returnseq_va...
Simulating Sequence Objects in SQL Server Many applications need sequentially incremental number as unique/primarykey of records.SQL Server 2005 today supports identity column as the primary mean to general sequence number, which generates the sequence number upon the execution of DML (insert) or bulk...
SQL DECLARE@range_first_value_output SQL_VARIANT; EXEC sys.sp_sequence_get_range @sequence_name = N'Test.RangeSeq', @range_size = 4, @range_first_value = @range_first_value_output OUTPUT;SELECT@range_first_value_outputASFirstNumber; ...
SQL> SELECT sequence_name,min_value,max_value 2 increment_by,cycle_flag,order_flag, 3 cache_size,last_number 4 FROM user_sequences 5 WHERE sequence_name IN ('SEQ1','SEQ2','MY_SEQ'); SEQUENCE_NAME MIN_VALUE INCREMENT_BY C O CACHE_SIZE LAST_NUMBER ...
ORA-02287: sequence number not allowed here [edit] What causes this error? An ORA-02287 occurs when you use a sequence where it is not allowed. The usage of a sequence is limited and it can be used only in few areas of PL/SQL and SQL coding. ...
If the Database Engine is stopped after you use 22 numbers, the next intended sequence number in memory (23) is written to the system tables, replacing the previously stored number. After SQL Server restarts and a sequence number is needed, the starting number is read from the system tables...
SQL 複製 DECLARE @range_first_value_output SQL_VARIANT; EXEC sys.sp_sequence_get_range @sequence_name = N'Test.RangeSeq', @range_size = 4, @range_first_value = @range_first_value_output OUTPUT; SELECT @range_first_value_output AS FirstNumber; ...