CREATE TABLE sequence_table ( id INT PRIMARY KEY, name VARCHAR(255) ); DELIMITER $$ CREATE PROCEDURE generate_sequence(IN p_name VARCHAR(255), OUT p_id INT) BEGIN SELECT IFNULL(MAX(id), 0) + 1 INTO p_id FROM se
guarantees that sequence numbers are generated in order of request. You may want to use this option if you are using the sequence numbers as timestamps. Guaranteeing order is usually not important for sequences used to generate primary keys. NOORDER does not guarantee sequence numbers are generat...
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创建序列后,在表中使用序列的nextval()函数和generate_series(1,N)函数对表插入数据,请保证nextval的可调用次数大于等于N+1次,否则会因为generate_series()函数会调用N+1次而导致报错。 不支持在template1数据库中创建SEQUENCE。 语法格式 CREATESEQUENCEname[ INCREMENT [ BY ]increment][ MINVALUE minvalue | NO...
简介:Oracle中Sequence可以使用,但在MySQL中没有序列实现,Oracle往MySQL迁移Sequence要怎么处理,是否有替代方案呢? Oracle中Sequence定义和使用 Oracle中有Sequence序列生成器用于生成表的主键值,官方定义:Sequencesare database objects from which multiple users can generate unique integers. The sequence generator gener...
CACHENOCACHE NOCACHECACHENOCACHEORDERto guarantee that sequence numbers are generated in order of request. This clause is useful if you are using the sequence numbers as timestamps. Guaranteeing order is usually not important for sequences used to generate primary keys. ...
Unlike Identity, you can generate a new sequence value before using it in an insert Statement You can define both the minimum & maximum values, as well as cycling & cache size options for a sequence Unlike Identity, a sequence object will increment its value only when it is explicitly called...
In case of a system failure event, you will lose all cached sequence values that have not been used in committed SQL statements. ORDER Use ORDER to ensure that Oracle will generate the sequence numbers in order of request. This option is useful if you are using Oracle Real Application Clus...
To find the maximum possible value for a given data type, seeLimits inDB2 for z/OS®. CYCLEorNO CYCLE Specifies whether or not the sequence should continue to generate values after reaching either its maximum or minimum value. The boundary of the sequence can be reached either with the ne...
4.2)SQL中取序列号的用法: SELECT NCME_QUESTION_SEQ.nextval FROM dual SELECT NCME_QUESTION_SEQ.CURRVAL FROM dual 序: CREATE SEQUENCE command PURPOSE: To create a sequence. A sequence is a database object from which multiple users may generate unique integers. You can use sequences ...