auto-increment

问题 How I can assign a sequence value to a field "UID" which is NUll in existing sqlite table, for example table: FOO name UID A 1 B 2 C 100 D NULL E NULL F NULL what I want is table: FOO name UID A 1 B 2 C 100 D 101 E 102 F 103 Can some body help? I want to seek an alternative for using autoincrement on my own reason... thanks! 回答1: Register a function that returns the number of times it's called, and then do UPDATE FOO SET UID = 100 + increment() WHERE UID IS NULL 回答2: a drafted approach in my

问题 I have two value in one table in database which I need to autoincrement. First value is ID it's a primary kay and it is setup as Identity Column and have (Is Identity) - Yes in properties. And how setup my second value (number) to autoincrement. When I setup his property (Is Identity) yes it automaticly change Identity Column for number. Is possible to meke autoincrement for two value in one table in sql? 回答1: It is not possible to have more than one identity column in a table (and I can't

问题 This question already has an answer here : PostgreSQL gapless sequences (1 answer) Closed 6 years ago . i'm new to postgres. if in sqlserver we have a table with auto-increment, and 10 rows... and the last row have id = 10. when you delete the last row, the next you insert will get the id = 10 too... sure? but in postgres, using bigserial as pk, when i delete the row with the max Id, and insert a new row, it keeps incrementing more and more the pk number.. this is right? 回答1: That's right.

问题 This question already has an answer here : PostgreSQL gapless sequences (1 answer) Closed 6 years ago . i'm new to postgres. if in sqlserver we have a table with auto-increment, and 10 rows... and the last row have id = 10. when you delete the last row, the next you insert will get the id = 10 too... sure? but in postgres, using bigserial as pk, when i delete the row with the max Id, and insert a new row, it keeps incrementing more and more the pk number.. this is right? 回答1: That's right.

问题 Looking for a parse solution that copies from CSV into my database with the end result of serial ID's generated. Either on the backend, or upon copying. As is, my ID's are null after the copy. echo CREATE TABLE IF NOT EXISTS qs_facts_template (id SERIAL NOT NULL, symbol varchar(8), timestamp date, close real null, open real null, high real null, low real null, volume real null, CONSTRAINT qs_facts_template_key PRIMARY KEY (id)) WITH (OIDS=TRUE) TABLESPACE pg_default; ALTER TABLE qs_facts

问题 I posted a similar question a bit earlier but I was a bit confused because of the settings already set and by reading this http://mariadb.org/auto-increments-in-galera/ I totally understand and corrected the settings but from what I read the output of the auto increment id will be like both nodes are increment of 2 node 1 with offset 1 1,3,5,7 node 2 with offset 2 2,4,6,8 but when I create new rows...this happens create with node 1, node 1, node 2 would give me 1,3,4 it wouldn't give me 2

问题 Using MySQL 5.1.37 This isn't really a critical issue, one of our biz-dev people just asked about it and I didn't have a good answer. In our users table we have an auto-increment primary key. From time to time, it skips numbers and seems to be doing so at an increasing rate. My original thought was that when two concurrent signups occurred and one was invalid, that if the second signup was in progress while the first was failing, we would see skipped values since the second signup would use

问题 I have seen this issue around (See links at bottom) but I can't seem to figure out an answer. The problem is that I insert data on a table with an auto increment ID that is a primary key, and another field with a UNIQUE index to avoid duplicates. This works, but when that happens the ID is incremented, although no data has been stored. Would it be better to remove the auto increment, and handle it myself, selecting the max(ID)? At the moment I have tried several strategies to make it work as

问题 I understand that when using INSERT ... ON DUPLICATE KEY UPDATE in MySQL there are auto increment gaps when an insert fails. However -- I've noticed that the gaps only occur when a unique key constraint is violated. If the primary key constraint fails, no auto increment gap occurs. What's the reason for the difference between the two? Thanks! 回答1: If the auto increment field is the primary key, then duplication in the primary key can only happen if you explicitly set the auto increment field

问题 I am building a Queue Management System in C# using Sql Server 2008 R2. Providing Services in many departments at a time Like Customer Care, Ladies Section, Registration Section. For Example. For Ladies Section : Token {1-50} Customer Care : Token {51-350} Registration Section : Token {351-550} Normal Customers: Token {551-999} I am using this Approach, First of all i am looking from which department I am getting request. Check Token Range of this department in Table, then getting existing