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Task
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Major
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Resolution:
Duplicate
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Description:
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------------
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SEQUENCE engine as an embedded logical engine, it mainly used to generate unique number,
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it is the middle layer engine that use InnoDB or other storage engine as the based table engine,
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All query on sequence table will be changed into the operation on based table.
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the cache or other sequence value management is decided by SEQUENCE engine handler.
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According to the setting which is defined by 'CREATE SEQUENCE ... ' or 'CREATE SEQUENCE TABLE... + INSERT VALUES'.
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user can query the nextval or currval from sequence.
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In order to distinguish the normal SELECT statement, we supply new Syntax 'SELECT NEXTVAL FOR SEQUENCE';
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1. 'SELECT NEXTVAL FROM SEQUENCE' will return the based table record directly.
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2. 'SELECT NEXTVAL FOR SEQUENCE' will return the iteratored record.
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Syntax:
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-------
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CREATE SEQUENCE SYNTAX:
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CREATE SEQUENCE [IF NOT EXISTS] schema.sequence_name
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[START WITH <constant>]
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[MINVALUE <constant>]
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[MAXVALUE <constant>]
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[INCREMENT BY <constant>]
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[CACHE <constant> | NOCACHE]
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[CYCLE | NOCYCLE]
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;
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OR:
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CREATE SEQUENCE schema.sequence_name (
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`currval` bigint(21) NOT NULL COMMENT 'current value',
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`nextval` bigint(21) NOT NULL COMMENT 'next value',
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`minvalue` bigint(21) NOT NULL COMMENT 'min value',
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`maxvalue` bigint(21) NOT NULL COMMENT 'max value',
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`start` bigint(21) NOT NULL COMMENT 'start value',
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`increment` bigint(21) NOT NULL COMMENT 'increment value',
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`cache` bigint(21) NOT NULL COMMENT 'cache size',
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`cycle` bigint(21) NOT NULL COMMENT 'cycle state',
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`round` bigint(21) NOT NULL COMMENT 'already how many round'
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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INSERT INTO schema.sequence_name VALUES(0,0,1,9223372036854775807,1,1,10000,1,0);
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COMMIT;
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Strongly recommend the first CREATE SEQUENCE syntax.
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SHOW SYNTAX:
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SHOW CREATE SEQUENCE schema.sequence_name;
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SHOW CREATE TABLE schema.sequence_name;
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QUERY SYNTAX:
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SELECT [nextval | currval | *] FOR schema.sequence_name;
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SELECT [nextval | currval | *] FROM schema.sequence_name;
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Usage:
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------
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FOR EXAMPLE:
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create sequence s;
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create table t(id int);
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select nextval for s;
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insert into t select nextval for s;
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https://github.com/alibaba/AliSQL/commit/b2f60ae9106156b456ddc76fc148b0edbca1c66e
- duplicates
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MDEV-10139
Support for SEQUENCE objects
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Closed
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