Please have a look at the following code
INSERT INTO `test2.key_word` SELECT * from `test.key_word`
I am using PHPMyAdmin. This query simply gives the error No Database Selected when run inside the server 127.0.0.1 area. If I run this inside query inside the SQL Query in test2.key_word, then it says Table 'test2.test2.key_word' doesn't exist.
Below is how the test.key_word table is created
CREATE TABLE `key_word` (
`primary_key` bigint(20) NOT NULL AUTO_INCREMENT,
`indexVal` int(11) NOT NULL,
`hashed_word` char(3) NOT NULL,
PRIMARY KEY (`primary_key`),
KEY `hashed_word` (`hashed_word`,`indexVal`)
) ENGINE=InnoDB AUTO_INCREMENT=28570982 DEFAULT CHARSET=latin1
Below is how the test2.key_word table is created
CREATE TABLE `key_word` (
`primary_key` bigint(20) NOT NULL,
`indexVal` int(11) NOT NULL,
`hashed_word` char(3) NOT NULL,
PRIMARY KEY (`primary_key`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Why this is not getting copied? Please help.
Use as per below, you have made db and tablename as a single name encsoling by db.table.
INSERT INTO test2.key_word SELECT * from test.key_word;
Note: Make sure no of columns should be same in source and target table.
Related
I have a problem to get a next sequence id in my code. Though it was a legacy code i have to follow the same. Let me explain the logic which was followed.
CREATE TABLE `emp_seq` (
`id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=1234 DEFAULT CHARSET=utf8
Above table used to get the next sequence id for the below table. and also emp_seq table will have only one entry for the id.
CREATE TABLE `emp_info` (
`id` BIGINT(8) UNSIGNED NOT NULL,
`name` VARCHAR(128) DEFAULT '',
`active` TINYINT(2) DEFAULT '1',
`level` MEDIUMINT(8) DEFAULT '100',
PRIMARY KEY (`id`),
KEY `level` (`level`)
) ENGINE=INNODB DEFAULT CHARSET=utf8 COMMENT='employee information'
so whenever we trying to insert a new record to emp_info table, we are getting next sequence id from the table emp_seq by using below queries.
INSERT INTO emp_seq () VALUES ();
DELETE FROM emp_seq WHERE id < LAST_INSERT_ID;
Now the problem is, some times because of multiple asynchronous calls in the application, the same increment id has been shared to multiple records and trying to insert in the emp_info table and we are getting below error
"code":"ER_DUP_ENTRY","errno":1062,"sqlMessage":"Duplicate entry 1234 for key
Kindly help me how to resolve the issue.
I have the following table structure (example)
CREATE TABLE `Test` (
`id` int(11) NOT NULL,
`order_id` int(11) NOT NULL,
`position_id` int(11) NOT NULL,
`name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
`price` decimal(10,2) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
ALTER TABLE `Test` ADD PRIMARY KEY (`id`);
ALTER TABLE `Test` MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;
This table contains data that is constantly in need of updating. There is also new data that needs to be entered. Since there is a lot of data, it will take quite a long time to check each record to make it insert or update.
After studying the question, I realized that I need to use batch insert/update with:
INSERT on DUPLICATE KEY UPDATE
But the documentation says that the fields must have a unique index. But I don't have any unique fields, I can't use the ID field. The uniqueness of the record can only be in a combination of two fields order_id and position_id.
Is it possible to make a batch insert/update if the uniqueness of the record is a bundle of two fields?
You need a composite primary-key. You also don't need your AUTO_INCREMENT id column, so you can drop it.
Like so:
CREATE TABLE `Test` (
`order_id` int NOT NULL,
`position_id` int NOT NULL,
`name` varchar(255) NOT NULL COLLATE utf8mb4_unicode_ci,
`price` decimal(10,2) NOT NULL,
CONSTRAINT PK_Test PRIMARY KEY ( `order_id`, `position_id` )
) ENGINE=InnoDB
Then you can use INSERT ON DUPLICATE KEY UPDATE.
MySql: AUTO_INCREMENT is missing from some tables after running for about one month.
Initially: (show create table Foo)
CREATE TABLE `Foo` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(10) NOT NULL,
`type` tinyint(2) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8
After one month:
CREATE TABLE `Foo` (
`id` bigint(20) NOT NULL,
`name` varchar(10) NOT NULL,
`type` tinyint(2) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
AUTO_INCREMENT is missing. What is the cause?
Mysql Server version: 5.6.25, Linux
Someone must have changed it. This change does not happen spontaneously.
I can reproduce this change myself:
CREATE TABLE Foo ( id BIGINT AUTO_INCREMENT, ...
ALTER TABLE Foo MODIFY COLUMN id BIGINT;
SHOW CREATE TABLE Foo\G
*************************** 1. row ***************************
Table: foo
Create Table: CREATE TABLE `foo` (
`id` bigint(20) NOT NULL,
`name` varchar(10) NOT NULL,
`type` tinyint(2) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
Now the column shows it is BIGINT but not AUTO_INCREMENT.
Every time you MODIFY COLUMN or CHANGE COLUMN, you must repeat all the column options like NOT NULL and AUTO_INCREMENT and DEFAULT, or else it will revert to defaults (i.e. not auto-increment).
So I would interpret this shows that someone did an ALTER TABLE and didn't remember to include the AUTO_INCREMENT column option.
Just a thought.
If you have binary logs, you may see the alter query on the logs and when it was run. :)
Check if the binary log is enabled by
show variable like 'log_bin';
If binary log is enabled, find the likely period that the query could have been executed and then use mysqlbinlog to help you find it.
If binary log is not enabled, bad luck - as the previous post by Bill Karwin has suggested mysql does not change it on its own - someone must have changed it.
Error
SQL query:
CREATE TABLE `usersinputs` (
`ID` int(11) NOT NULL,
`name` varchar(20) NOT NULL,
`email` varchar(30) NOT NULL,
`message` varchar(100) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
MySQL said: Documentation
#1050 - Table 'usersinputs' already exists
Your error says it all. There is already a table named as userinputs in your database. You need to create a table with a different name or if there is any datatype change or any other alteration to the table then you need to ALTER the table.
Instead of creating a table which already exists try one with another name.
You can however alter or check if the table exists:
CREATE TABLE IF NOT EXISTS `usersinputs` (
`ID` int(11) NOT NULL,
`name` varchar(20) NOT NULL,
`email` varchar(30) NOT NULL,
`message` varchar(100) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
The error is due to the table usersinputs is already exists in your database.
If you really want to CREATE a new table with the different columns and data types you can DROP the existing table and CREATE the new table by DROP TABLE IF EXISTS `usersinputs`;
So your code will be:
DROP TABLE IF EXISTS `usersinputs`;
CREATE TABLE `usersinputs` (
`ID` int(11) NOT NULL,
`name` varchar(20) NOT NULL,
`email` varchar(30) NOT NULL,
`message` varchar(100) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Or simply want to change any column name or data type use ALTER TABLE
I am trying to translate a collection of MySQL functions to SQL, and I'm having issues with a UNIQUE KEY issue:
-- -----------------------------------------------------
-- Table testform
-- -----------------------------------------------------
CREATE TABLE `testform` (
`FormId` INT(11) NOT NULL AUTO_INCREMENT,
`TTId` INT(11) NULL DEFAULT NULL,
`TestName` VARCHAR(100) NULL,
PRIMARY KEY (`FormId`),
UNIQUE KEY `TF_Composite` (`TTId`, `TestName`));
When I try and test this in SQLFiddle, it's giving me the error
Incorrect syntax near the keyword 'KEY'.
I have tried searching for this, but so far all I have come up with is "Unique Constraints". Is there a difference between a "Key" and a "Constraint" in SQL? And if so, how can I add this in the table creation statement?
Your syntax is all messed up. Please look at books on-line (MSDN).
https://msdn.microsoft.com/en-us/library/ms174979.aspx
The sample code below create a table in tempdb. This table automatically gets destroyed when the service is restarted.
-- Just a example, throw away after reboot
USE [tempdb]
GO
-- Create the table
CREATE TABLE DBO.TESTFORM
(
FORM_ID INT IDENTITY(1, 1) NOT NULL ,
TT_ID INT NULL,
TEST_NAME VARCHAR(100) NULL,
CONSTRAINT PK_FORM_ID PRIMARY KEY (FORM_ID),
CONSTRAINT UN_COMPOSIT UNIQUE (TT_ID, TEST_NAME)
);
-- Seventies Band
INSERT INTO TEMPDB.DBO.TESTFORM VALUES (1, 'John');
INSERT INTO TEMPDB.DBO.TESTFORM VALUES (2, 'Paul');
INSERT INTO TEMPDB.DBO.TESTFORM VALUES (3, 'Mary');
GO
-- Show data
SELECT * FROM TEMPDB.DBO.TESTFORM
GO
The image below shows the data in this table.
Try This.
CREATE TABLE testform (
FormId INT(11) NOT NULL AUTO_INCREMENT,
TTId INT(11) NULL DEFAULT NULL,
TestName VARCHAR(100) NULL,
PRIMARY KEY (FormId),
CONSTRAINT TF_Composite UNIQUE (TTId,TestName));
More Details..
For Better Understanding about Primary and Unique you can refer below page.
Primary and Unique Key Creation
For MySQL Database
CREATE TABLE `phone` (
`id` MEDIUMINT(8) UNSIGNED NOT NULL AUTO_INCREMENT,
`country` DECIMAL(5,0) UNSIGNED NOT NULL,
`area` DECIMAL(5,0) UNSIGNED NOT NULL,
`number` DECIMAL(8,0) UNSIGNED NOT NULL,
`extension` DECIMAL(5,0) UNSIGNED DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `ix_phone` (`country`, `area`, `number`, `extension`),
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;
For alter Table :
ALTER TABLEphone
ADD UNIQUE INDEXix_phone(country,area,number,extension);