- May 28, 2017 In this video you will learn How to get primary key value (auto-generated keys) from inserted queries in JDBC using a demo project. Below is the GitHub link to download source code.
- I am trying to alter a table which has no primary key nor autoincrement column. I know how to add an primary key column but I was wondering if it's possible to insert data into the primary key col.
Mar 21, 2017 The problem is Pomelo generates create table script without autoincement on Id column. This comment has been minimized. Causes the script generated without the autoincrement on primary key. Duplicate entry '0' for key ' PRIMARY' at MySql.Data.MySqlClient.MySqlDataReader.ActivateResultSet(ResultSet resultSet) at MySql.
A primary key column often has the AUTOINCREMENT attribute that automatically generates a sequential integer whenever you insert a new row into the table. When you define a primary key for a table, MySQL automatically creates an index called PRIMARY. MySQL PRIMARY KEY examples. Mysql Auto generated Key Value Executes the below program, Which insert the record in the trnemployee table. After record insertion it return the auto generated primary key value getGeneratedKeys method returns the ResultSet object and from that. MySQL uses the AUTOINCREMENT keyword to perform an auto-increment feature. By default, the starting value for AUTOINCREMENT is 1, and it will increment by 1 for each new record. To let the AUTOINCREMENT sequence start with another value, use the following SQL statement: ALTER TABLE Persons AUTOINCREMENT=100. It automatically generates an integer number (1, 2, 3, and so forth) when a new record is inserted into the table. A column like this is a good candidate for surrogate key column which acts as a primary key in the table. To create the auto number in MySQL, set the AUTOINCREMENT attribute to a column.
Date: February 23, 2017 11:01AM
I am new to MYSQL workbench.
I have a csv file I am trying to import.
I have had it successfully import (sort of)
My data has lots of duplicate data and no one field by itself can serve as a primary key (I can combine some fields if we can't get this working)
I created a field a_id and checked PK, NN, and AI.
I am almost certain I saw the auto-increment work once, but as I am setting things up I have deleted and data and change things and go again -
Now I am getting an error:
ERROR 1366: Incorrect integer value: ' for column 'averaged_historical_forecasts_a_id' at row 1
SQL Statement:
here is 'a' workbench generated statement:
INSERT INTO `temperature_forecasts`.`averaged_historical_forecasts_a` (`Read_Date`, `Read_Time`, `Forecast__Date`, `_Forecast_Time_`, `Start_Hour`, `End_Hour`, `Columbia_ACCU-Weather`, `Columbia__NOAA`, `Lewisburg_ACCU-Weather`, `Lewisburg_NOAA`, `Shelbyville_ACCU-Weather`, `Shelbyville_NOAA`, `Manchester_ACCU-Weather`, `Manchester_NOAA`, `Decherd_ACCU-Weather`, `Decherd_NOAA`, `averaged_historical_forecasts_a_id`) VALUES ('2015-02-05', '7:55', '2015-02-05', ' 8:00 - 9:00', ' 8:00', '9:00', '27.5', '26.5', '27.5', '27', '27.5', '28', '27.5', '28', '29.5', '30', ');
I would have thought the INSERT statement would not include the id and notice the comma at the end before the closing parentheses.
Bottom line - I am trying to import from a csv file some data and not have to create a primary key by combine data within the csv and use the auto-increment but I am doing all of this within the workbench environment
Thanks
Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.
- Related Questions & Answers
- Selected Reading
While creating a table, in certain scenarios, we need values to column such as ID, to be generated/incremented automatically. Various databases support this feature in different ways.
In MySQL database you can declare a column auto increment using the following syntax.
MySQL query to create a table with auto-incremented column. /generate-ssh-host-key-windows.html.
Create Table With Primary Key Mysql
Example
Following JDBC program establishes a connection with MYSQL database and creates a query with an auto-incremented column.
Output
Verification
Auto Increment Non Primary Key Mysql
The DESCRIBE command in MYSQL gives the description of a table, you can verify the creation of the table with auto-incremented column using it, as shown below −