SELECT * FROM USER_SEQUENCES WHERE SEQUENCE_NAME= '自增序列名称'; 1. 2. 3. 4. 5. 3.查看自增序列下次自增的值 select “自增序列名称”.NEXTVAL from dual; 1. 2. 4.创建自增序列从一开始每次加1 CREATE SEQUENCE "自增序列名称_ID_SEQ" MINVALUE 1 NOMAXVALUE INCREMENT BY 1 START WITH ...
nextval(sequence_name TEXT) RETURNS BIGINT BEGIN DECLARE next_value BIGINT; -- 获取序列的下一个值 SELECT sequence_name INTO next_value FROM sequences WHERE name = sequence_name; -- 更新序列的当前值 UPDATE sequences SET value = value + 1 WHERE name = sequence_name; RETURN next_value; ...
1、Create Sequence 你首先要有CREATE SEQUENCE或者CREATE ANY SEQUENCE权限, CREATE SEQUENCE emp_sequence INCREMENT BY 1 -- 每次加几个 START WITH 1 -- 从1开始计数 NOMAXVALUE -- 不设置最大值 NOCYCLE -- 一直累加,不循环 CACHE 10; 一旦定义了emp_sequence,你就可以用CURRVAL,NEXTVAL CURRVAL=返回 sequ...
在PostgreSQL中,生成一系列列可以通过使用序列(Sequence)来实现。序列是一种特殊的数据库对象,用于生成唯一的数字序列。它通常与表的主键或其他需要唯一标识的列一起使用。 生成一系列列的步骤如下: 创建序列:使用CREATE SEQUENCE语句创建一个序列对象,指定序列的名称、起始值、增量值等参数。例如: 创建序列:使用CREATE...
NodeTag type;char*name;/* column name or NULL */// id columnList *indirection;/* subscripts, field names, and '*', or NIL */Node *val;/* the value expression to compute or assign */// = 1表达式节点存在这里intlocation;/* token location, or -1 if unknown */} ResTarget; ...
首先看一下步骤：创建父表先创建一张“父表”，所有分区表都从它继承，这个表中没有数据，也不要在这个表上定义任何检查约束及索引，现在我们就先创建这样一张表，但之前先建一个序列：CREATE SEQUENCE "public"."control_alarm_info_uid_seq"INCREMENT 1MINVALUE 1MAXVALUE 99999999START 1CACHE 1;ALTER TABLE...
grant all on sequence名称 to 所有者; 61.修改sequence初始值 Alter SEQUENCE sequencename START value; 62.查看sequence当前值 SELECT currval('sequencename'); 63.查看sequence下一值 SELECT nextval('sequencename'); 64.设置sequence当前值 alter SEQUENCE sequencename restart with startvalue; ...
CREATE SEQUENCE "public"."control_alarm_info_uid_seq" INCREMENT 1 MINVALUE 1 MAXVALUE 99999999 START 1 CACHE 1; ALTER TABLE "public"."control_alarm_info_uid_seq " OWNER TO "postgres"; 接下来创建“父表”, -- Table: control_alarm_info ...
INSERT INTO foo (a, b) SELECT i, 'foo ' || i::text FROM generate_series(1, 5) i;...
(''' || sequence_name || ''')'; RETURN start_with;END;$$ LANGUAGE plpgsql VOLATILE;像这样使用它:INSERT INTO foo (data) VALUES ('asdf');-- ERROR: null value in column "a" violates not-null constraintSELECT make_into_serial('foo', 'a');INSERT INTO foo (data) ...