database-sequence | 易学教程

Add auto increment column to existing table ordered by date

阅读更多关于 Add auto increment column to existing table ordered by date

问题 I have an existing table named "tickets" in database with columns: id (string, Primary Key, contains UUID like e6c49164-545a-43a1-845f-73c5163962f2) date (biginteger, stores epoch) status (string) I need to add new auto increment column ticket_id but the values to be generated should be according to "date" column value. I tried this: ALTER TABLE "tickets" ADD COLUMN "ticket_id" SERIAL; The problem is, it is generating "ticket_id" values in some weird order, looks like it is based on "id"

Add auto increment column to existing table ordered by date

阅读更多关于 Add auto increment column to existing table ordered by date

Sequence does not exist when it does - Postgres/Spring Boot

阅读更多关于 Sequence does not exist when it does - Postgres/Spring Boot

问题 I am writing a Spring Boot web-app and using a Postgres db to persist my data. I created a table in Postgres using create table user (id bigserial primary key not null, name text not null; and identified its sequence_name by looking at the schema (in this case, it is user_id_seq ). Then, in my User entity class in Spring Boot, I added the following: @Entity @Table(name = "user") public class User implements Serializable { @Id @SequenceGenerator(name = "user_local_seq", sequenceName = "user_id

Oracle 12.2 - Replacement of NOPARTITION feature

阅读更多关于 Oracle 12.2 - Replacement of NOPARTITION feature

问题 I have Oracle version 12.2.0.1.0 We have generic script which create sequence that need to be reuse for different objects (by renaming sequence name): CREATE SEQUENCE NAME_SEQ MINVALUE 1 MAXVALUE 999999999 INCREMENT BY 1 START WITH 100 CACHE 200 NOORDER NOCYCLE NOPARTITION ; This script isn't working with below error until I remove NOPARTITION : ORA-00933: SQL command not properly ended I found in AskTom that the NOPARTITION is not supported in 12.2 there's been various of things in previous

postgres how to reset or update index(sequence) of table

阅读更多关于 postgres how to reset or update index(sequence) of table

问题 i deleted 2000 row in my table and then i inserted same 2000 records but their index(id auto increment field) starting from 2001, now i want to update those index 2001 - 4000 to 1-2000 回答1: To update your id run the following command. UPDATE table SET id = id - 2000; This will update the id of records in your table and then you need update the table's sequence ALTER SEQUENCE table_id_seq RESTART WITH 2001; This will allow you to insert the data with the id 2001 Another way, delete all the

postgres how to reset or update index(sequence) of table

阅读更多关于 postgres how to reset or update index(sequence) of table

Django with legacy database - how to work with DB sequences?

阅读更多关于 Django with legacy database - how to work with DB sequences?

问题 Given a database table that was created using this SQL query: CREATE TABLE Bill ( Time DATE NOT NULL , Address VARCHAR2 (60) NOT NULL , ID NUMBER NOT NULL ) ; ALTER TABLE Bill ADD CONSTRAINT Bill_PK PRIMARY KEY ( ID ) ; CREATE SEQUENCE Bill_ID_SEQ START WITH 1 NOCACHE ORDER ; CREATE OR REPLACE TRIGGER Bill_ID_TRG BEFORE INSERT ON Paragony FOR EACH ROW BEGIN :NEW.ID := Bill_ID_SEQ.NEXTVAL; END; I have to use it with Django ORM so I have run inspectdb command. It is the autogenerated code:

How to implement multidimensional sequences

阅读更多关于 How to implement multidimensional sequences

问题 For example, here is a yearly sequence. The no increments with year : | no | year | +----+------+ | 1 | 2016 | | 2 | 2016 | | 3 | 2016 | | 1 | 2017 | | 2 | 2017 | | 4 | 2016 | For now I have created sequence for each year but the problem is Oracle will not automatically create new sequence in next year. Another problem is if I want to use a 3D sequence, incrementing within year and type : | no | year | type | +----+------+------+ | 1 | 2016 | a | | 2 | 2016 | a | | 1 | 2016 | b | | 1 | 2017 |

Postgres insert value from insert in other table

阅读更多关于 Postgres insert value from insert in other table

问题 I have two tables: CREATE TABLE tbl_a ( id serial primary key NOT NULL, name text NOT NULL, tbl_b_reference NOT NULL ) CREATE TABLE tbl_b ( id serial primary key NOT NULL, status text) I want to do two inserts. One in tbl_b, and then use the id from that insert when I do my insert into tbl_a. I've tried this: INSERT INTO tbl_a(name, tbl_b_reference) VALUES ("myName", (INSERT INTO tbl_b (status) VALUES ('OK') RETURNING id)); but I only get a syntax error pointing at the second "INTO" ERROR:

How to create a database sequence which is different for different channels?

阅读更多关于 How to create a database sequence which is different for different channels?

We have one requirement where different database sequences needs to be maintained for different channels. EX: ABC-SQN1, XYZ-1, and the Sequence nos needs to be incremented based on channels. Is there a way we can achieve it. Thanks Your question is unclear. Please describe requirements more datailed. I understand you want to have a few sequences and increment them conditionally so: create sequence chanel1_seq INCREMENT BY 1 START WITH 1; create sequence chanel2_seq INCREMENT BY 1 START WITH 1; create sequence chanel3_seq INCREMENT BY 1 START WITH 1; and then access sequence set by function not