I run this query
CREATE TEMPORARY TABLE usercount SELECT * FROM users
I get this message
Your SQL query has been executed successfully ( Query took 0.1471 sec )
But when I try to access the newly created table using
SELECT * FROM usercount
I get this error
#1146 - Table 'abc_site.usercount' doesn't exist
Not sure why, I need to mention that I've did a good share of googling beforehand.
My version of PHPMyAdmin is 3.5.2.2 and MySQL 5.5.27
PHPMyAdmin (or rather PHP) closes the database connection after each screen. Thus your temporary tables disappear.
You can put multiple SQL statements in the SQL query box in PHPMyAdmin; this should be executed as one block and thus the temporary table is not deleted.
Temporary tables are temparar and after use thay Delete.
for example ,when insert data into database , first we can insert into temp table and thus when complete transaction , then insert into main table.
EXAMPLE :
//------------------------------------------
CREATE TEMPORARY TABLE TEMP
(
USERNAME VARCHAR(50) NOT NULL,
PASSWORD VARCHAR(50) NOT NULL,
EMAIL varchar(100),
TYPE_USER INT
);
INSERT INTO TEMP VALUES('A','A','A','1');
SELECT * FROM TEMP
//-----------------------------------------
Show A,A,A,1
Related
I need a table variable to store the particular rows from the table within the MySQL procedure.
E.g. declare #tb table (id int,name varchar(200))
Is this possible? If yes how?
They don't exist in MySQL do they? Just use a temp table:
CREATE PROCEDURE my_proc () BEGIN
CREATE TEMPORARY TABLE TempTable (myid int, myfield varchar(100));
INSERT INTO TempTable SELECT tblid, tblfield FROM Table1;
/* Do some more stuff .... */
From MySQL here
"You can use the TEMPORARY keyword
when creating a table. A TEMPORARY
table is visible only to the current
connection, and is dropped
automatically when the connection is
closed. This means that two different
connections can use the same temporary
table name without conflicting with
each other or with an existing
non-TEMPORARY table of the same name.
(The existing table is hidden until
the temporary table is dropped.)"
Perhaps a temporary table will do what you want.
CREATE TEMPORARY TABLE SalesSummary (
product_name VARCHAR(50) NOT NULL
, total_sales DECIMAL(12,2) NOT NULL DEFAULT 0.00
, avg_unit_price DECIMAL(7,2) NOT NULL DEFAULT 0.00
, total_units_sold INT UNSIGNED NOT NULL DEFAULT 0
) ENGINE=MEMORY;
INSERT INTO SalesSummary
(product_name, total_sales, avg_unit_price, total_units_sold)
SELECT
p.name
, SUM(oi.sales_amount)
, AVG(oi.unit_price)
, SUM(oi.quantity_sold)
FROM OrderItems oi
INNER JOIN Products p
ON oi.product_id = p.product_id
GROUP BY p.name;
/* Just output the table */
SELECT * FROM SalesSummary;
/* OK, get the highest selling product from the table */
SELECT product_name AS "Top Seller"
FROM SalesSummary
ORDER BY total_sales DESC
LIMIT 1;
/* Explicitly destroy the table */
DROP TABLE SalesSummary;
From forge.mysql.com. See also the temporary tables piece of this article.
TO answer your question: no, MySQL does not support Table-typed variables in the same manner that SQL Server (http://msdn.microsoft.com/en-us/library/ms188927.aspx) provides. Oracle provides similar functionality but calls them Cursor types instead of table types (http://docs.oracle.com/cd/B12037_01/appdev.101/b10807/13_elems012.htm).
Depending your needs you can simulate table/cursor-typed variables in MySQL using temporary tables in a manner similar to what is provided by both Oracle and SQL Server.
However, there is an important difference between the temporary table approach and the table/cursor-typed variable approach and it has a lot of performance implications (this is the reason why Oracle and SQL Server provide this functionality over and above what is provided with temporary tables).
Specifically: table/cursor-typed variables allow the client to collate multiple rows of data on the client side and send them up to the server as input to a stored procedure or prepared statement. What this eliminates is the overhead of sending up each individual row and instead pay that overhead once for a batch of rows. This can have a significant impact on overall performance when you are trying to import larger quantities of data.
A possible work-around:
What you may want to try is creating a temporary table and then using a LOAD DATA (http://dev.mysql.com/doc/refman/5.1/en/load-data.html) command to stream the data into the temporary table. You could then pass them name of the temporary table into your stored procedure. This will still result in two calls to the database server, but if you are moving enough rows there may be a savings there. Of course, this is really only beneficial if you are doing some kind of logic inside the stored procedure as you update the target table. If not, you may just want to LOAD DATA directly into the target table.
MYSQL 8 does, in a way:
MYSQL 8 supports JSON tables, so you could load your results into a JSON variable and select from that variable using the JSON_TABLE() command.
If you don't want to store table in database then #Evan Todd already has been provided temporary table solution.
But if you need that table for other users and want to store in db then you can use below procedure.
Create below ‘stored procedure’:
————————————
DELIMITER $$
USE `test`$$
DROP PROCEDURE IF EXISTS `sp_variable_table`$$
CREATE DEFINER=`root`#`localhost` PROCEDURE `sp_variable_table`()
BEGIN
SELECT CONCAT(‘zafar_’,REPLACE(TIME(NOW()),’:',’_')) INTO #tbl;
SET #str=CONCAT(“create table “,#tbl,” (pbirfnum BIGINT(20) NOT NULL DEFAULT ’0′, paymentModes TEXT ,paymentmodeDetails TEXT ,shippingCharges TEXT ,shippingDetails TEXT ,hypenedSkuCodes TEXT ,skuCodes TEXT ,itemDetails TEXT ,colorDesc TEXT ,size TEXT ,atmDesc TEXT ,promotional TEXT ,productSeqNumber VARCHAR(16) DEFAULT NULL,entity TEXT ,entityDetails TEXT ,kmtnmt TEXT ,rating BIGINT(1) DEFAULT NULL,discount DECIMAL(15,0) DEFAULT NULL,itemStockDetails VARCHAR(38) NOT NULL DEFAULT ”) ENGINE=INNODB DEFAULT CHARSET=utf8″);
PREPARE stmt FROM #str;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SELECT ‘Table has been created’;
END$$
DELIMITER ;
———————————————–
Now you can execute this procedure to create a variable name table as per below-
call sp_variable_table();
You can check new table after executing below command-
use test;show tables like ‘%zafar%’; — test is here ‘database’ name.
You can also check more details at below path-
http://mydbsolutions.in/how-can-create-a-table-with-variable-name/
I'm working on an application that is deployed to Heroku and using the JawsDB add on to replicate my local MySQL database. I recently updated a table in the local MySQL database (Plans) to include two new rows, 'plan_dates' and 'plan_times', but the hosted JawsDB did not automatically sync with the changes made on my local connection.
I opened up the JawsDB database on MySQL using the connection string provided by Heroku to try and add in the rows manually. These are the rows in the Plan table that I am trying to edit:
database rows
I've searched online, but I cannot find any resources on how to add new (empty) rows to a table on MySQL -- all I can find online are references to 'INSERT INTO', which inserts specific values into rows, but that's not exactly what I'm looking to do. I did try running INSERT INTO as follows:
INSERT INTO Plans (plan_dates, plan_times)
VALUES(NULL, NULL);
but then I ran into the following error:
Unknown column 'plan_dates' in 'field list'
Am I missing a very simple command or is there any other way to add new empty rows to a table that has already been created in MySQL?
First of all, The columns are not exist in your table and you must add it to the table using ALTER Table query.
Syntax would be
ALTER TABLE table
ADD [COLUMN] column_name column_definition [FIRST|AFTER existing_column];
So your query should be
ALTER TABLE Plans
ADD COLUMN plan_dates Date AFTER UserId,
ADD COLUMN plan_times TIME AFTER UserId;
And you can use INSERT statement to add new empty rows.
INSERT INTO Plans (id, start_date, end_date, maxMins, totalMins, UserId, plan_dates, plan_times) VALUES(1, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
I need a table variable to store the particular rows from the table within the MySQL procedure.
E.g. declare #tb table (id int,name varchar(200))
Is this possible? If yes how?
They don't exist in MySQL do they? Just use a temp table:
CREATE PROCEDURE my_proc () BEGIN
CREATE TEMPORARY TABLE TempTable (myid int, myfield varchar(100));
INSERT INTO TempTable SELECT tblid, tblfield FROM Table1;
/* Do some more stuff .... */
From MySQL here
"You can use the TEMPORARY keyword
when creating a table. A TEMPORARY
table is visible only to the current
connection, and is dropped
automatically when the connection is
closed. This means that two different
connections can use the same temporary
table name without conflicting with
each other or with an existing
non-TEMPORARY table of the same name.
(The existing table is hidden until
the temporary table is dropped.)"
Perhaps a temporary table will do what you want.
CREATE TEMPORARY TABLE SalesSummary (
product_name VARCHAR(50) NOT NULL
, total_sales DECIMAL(12,2) NOT NULL DEFAULT 0.00
, avg_unit_price DECIMAL(7,2) NOT NULL DEFAULT 0.00
, total_units_sold INT UNSIGNED NOT NULL DEFAULT 0
) ENGINE=MEMORY;
INSERT INTO SalesSummary
(product_name, total_sales, avg_unit_price, total_units_sold)
SELECT
p.name
, SUM(oi.sales_amount)
, AVG(oi.unit_price)
, SUM(oi.quantity_sold)
FROM OrderItems oi
INNER JOIN Products p
ON oi.product_id = p.product_id
GROUP BY p.name;
/* Just output the table */
SELECT * FROM SalesSummary;
/* OK, get the highest selling product from the table */
SELECT product_name AS "Top Seller"
FROM SalesSummary
ORDER BY total_sales DESC
LIMIT 1;
/* Explicitly destroy the table */
DROP TABLE SalesSummary;
From forge.mysql.com. See also the temporary tables piece of this article.
TO answer your question: no, MySQL does not support Table-typed variables in the same manner that SQL Server (http://msdn.microsoft.com/en-us/library/ms188927.aspx) provides. Oracle provides similar functionality but calls them Cursor types instead of table types (http://docs.oracle.com/cd/B12037_01/appdev.101/b10807/13_elems012.htm).
Depending your needs you can simulate table/cursor-typed variables in MySQL using temporary tables in a manner similar to what is provided by both Oracle and SQL Server.
However, there is an important difference between the temporary table approach and the table/cursor-typed variable approach and it has a lot of performance implications (this is the reason why Oracle and SQL Server provide this functionality over and above what is provided with temporary tables).
Specifically: table/cursor-typed variables allow the client to collate multiple rows of data on the client side and send them up to the server as input to a stored procedure or prepared statement. What this eliminates is the overhead of sending up each individual row and instead pay that overhead once for a batch of rows. This can have a significant impact on overall performance when you are trying to import larger quantities of data.
A possible work-around:
What you may want to try is creating a temporary table and then using a LOAD DATA (http://dev.mysql.com/doc/refman/5.1/en/load-data.html) command to stream the data into the temporary table. You could then pass them name of the temporary table into your stored procedure. This will still result in two calls to the database server, but if you are moving enough rows there may be a savings there. Of course, this is really only beneficial if you are doing some kind of logic inside the stored procedure as you update the target table. If not, you may just want to LOAD DATA directly into the target table.
MYSQL 8 does, in a way:
MYSQL 8 supports JSON tables, so you could load your results into a JSON variable and select from that variable using the JSON_TABLE() command.
If you don't want to store table in database then #Evan Todd already has been provided temporary table solution.
But if you need that table for other users and want to store in db then you can use below procedure.
Create below ‘stored procedure’:
————————————
DELIMITER $$
USE `test`$$
DROP PROCEDURE IF EXISTS `sp_variable_table`$$
CREATE DEFINER=`root`#`localhost` PROCEDURE `sp_variable_table`()
BEGIN
SELECT CONCAT(‘zafar_’,REPLACE(TIME(NOW()),’:',’_')) INTO #tbl;
SET #str=CONCAT(“create table “,#tbl,” (pbirfnum BIGINT(20) NOT NULL DEFAULT ’0′, paymentModes TEXT ,paymentmodeDetails TEXT ,shippingCharges TEXT ,shippingDetails TEXT ,hypenedSkuCodes TEXT ,skuCodes TEXT ,itemDetails TEXT ,colorDesc TEXT ,size TEXT ,atmDesc TEXT ,promotional TEXT ,productSeqNumber VARCHAR(16) DEFAULT NULL,entity TEXT ,entityDetails TEXT ,kmtnmt TEXT ,rating BIGINT(1) DEFAULT NULL,discount DECIMAL(15,0) DEFAULT NULL,itemStockDetails VARCHAR(38) NOT NULL DEFAULT ”) ENGINE=INNODB DEFAULT CHARSET=utf8″);
PREPARE stmt FROM #str;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SELECT ‘Table has been created’;
END$$
DELIMITER ;
———————————————–
Now you can execute this procedure to create a variable name table as per below-
call sp_variable_table();
You can check new table after executing below command-
use test;show tables like ‘%zafar%’; — test is here ‘database’ name.
You can also check more details at below path-
http://mydbsolutions.in/how-can-create-a-table-with-variable-name/
I've recently moved from MSSQL to MySQL.
I would like to use a table variable (or equivalent) inside a MySQL 5.5 stored routine, to populate a dataset for an online report.
In MS SQL, I would do it this way
...
...
DECLARE #tblName TABLE
WHILE <condition>
BEGIN
Insert Row based on iteration value
END
...
...
From what I understand, I can't declare table variables in MySQL (correct me if I'm wrong) How do I implement the above logic in a MySQL stored procedure?
You could create a table or temporary table and populate it with data you need.
CREATE TABLE Syntax
You understand that limitation correctly. The MySQL user manual clearly states that user-defined variables cannot refer to a table:
http://dev.mysql.com/doc/refman/5.5/en/user-variables.html
User variables are intended to provide data values. They cannot be used directly in an SQL statement as an identifier or as part of an identifier, such as in contexts where a table or database name is expected, or as a reserved word such as SELECT.
create temporary table tmp
(
id int unsigned not null,
name varchar(32) not null
)
engine=memory; -- change engine type if required e.g myisam/innodb
insert into tmp (id, name) select id, name from foo... ;
-- do more work...
select * from tmp order by id;
drop temporary table if exists tmp;
I think this covers it. Also, this may be helpful.
I need a table variable to store the particular rows from the table within the MySQL procedure.
E.g. declare #tb table (id int,name varchar(200))
Is this possible? If yes how?
They don't exist in MySQL do they? Just use a temp table:
CREATE PROCEDURE my_proc () BEGIN
CREATE TEMPORARY TABLE TempTable (myid int, myfield varchar(100));
INSERT INTO TempTable SELECT tblid, tblfield FROM Table1;
/* Do some more stuff .... */
From MySQL here
"You can use the TEMPORARY keyword
when creating a table. A TEMPORARY
table is visible only to the current
connection, and is dropped
automatically when the connection is
closed. This means that two different
connections can use the same temporary
table name without conflicting with
each other or with an existing
non-TEMPORARY table of the same name.
(The existing table is hidden until
the temporary table is dropped.)"
Perhaps a temporary table will do what you want.
CREATE TEMPORARY TABLE SalesSummary (
product_name VARCHAR(50) NOT NULL
, total_sales DECIMAL(12,2) NOT NULL DEFAULT 0.00
, avg_unit_price DECIMAL(7,2) NOT NULL DEFAULT 0.00
, total_units_sold INT UNSIGNED NOT NULL DEFAULT 0
) ENGINE=MEMORY;
INSERT INTO SalesSummary
(product_name, total_sales, avg_unit_price, total_units_sold)
SELECT
p.name
, SUM(oi.sales_amount)
, AVG(oi.unit_price)
, SUM(oi.quantity_sold)
FROM OrderItems oi
INNER JOIN Products p
ON oi.product_id = p.product_id
GROUP BY p.name;
/* Just output the table */
SELECT * FROM SalesSummary;
/* OK, get the highest selling product from the table */
SELECT product_name AS "Top Seller"
FROM SalesSummary
ORDER BY total_sales DESC
LIMIT 1;
/* Explicitly destroy the table */
DROP TABLE SalesSummary;
From forge.mysql.com. See also the temporary tables piece of this article.
TO answer your question: no, MySQL does not support Table-typed variables in the same manner that SQL Server (http://msdn.microsoft.com/en-us/library/ms188927.aspx) provides. Oracle provides similar functionality but calls them Cursor types instead of table types (http://docs.oracle.com/cd/B12037_01/appdev.101/b10807/13_elems012.htm).
Depending your needs you can simulate table/cursor-typed variables in MySQL using temporary tables in a manner similar to what is provided by both Oracle and SQL Server.
However, there is an important difference between the temporary table approach and the table/cursor-typed variable approach and it has a lot of performance implications (this is the reason why Oracle and SQL Server provide this functionality over and above what is provided with temporary tables).
Specifically: table/cursor-typed variables allow the client to collate multiple rows of data on the client side and send them up to the server as input to a stored procedure or prepared statement. What this eliminates is the overhead of sending up each individual row and instead pay that overhead once for a batch of rows. This can have a significant impact on overall performance when you are trying to import larger quantities of data.
A possible work-around:
What you may want to try is creating a temporary table and then using a LOAD DATA (http://dev.mysql.com/doc/refman/5.1/en/load-data.html) command to stream the data into the temporary table. You could then pass them name of the temporary table into your stored procedure. This will still result in two calls to the database server, but if you are moving enough rows there may be a savings there. Of course, this is really only beneficial if you are doing some kind of logic inside the stored procedure as you update the target table. If not, you may just want to LOAD DATA directly into the target table.
MYSQL 8 does, in a way:
MYSQL 8 supports JSON tables, so you could load your results into a JSON variable and select from that variable using the JSON_TABLE() command.
If you don't want to store table in database then #Evan Todd already has been provided temporary table solution.
But if you need that table for other users and want to store in db then you can use below procedure.
Create below ‘stored procedure’:
————————————
DELIMITER $$
USE `test`$$
DROP PROCEDURE IF EXISTS `sp_variable_table`$$
CREATE DEFINER=`root`#`localhost` PROCEDURE `sp_variable_table`()
BEGIN
SELECT CONCAT(‘zafar_’,REPLACE(TIME(NOW()),’:',’_')) INTO #tbl;
SET #str=CONCAT(“create table “,#tbl,” (pbirfnum BIGINT(20) NOT NULL DEFAULT ’0′, paymentModes TEXT ,paymentmodeDetails TEXT ,shippingCharges TEXT ,shippingDetails TEXT ,hypenedSkuCodes TEXT ,skuCodes TEXT ,itemDetails TEXT ,colorDesc TEXT ,size TEXT ,atmDesc TEXT ,promotional TEXT ,productSeqNumber VARCHAR(16) DEFAULT NULL,entity TEXT ,entityDetails TEXT ,kmtnmt TEXT ,rating BIGINT(1) DEFAULT NULL,discount DECIMAL(15,0) DEFAULT NULL,itemStockDetails VARCHAR(38) NOT NULL DEFAULT ”) ENGINE=INNODB DEFAULT CHARSET=utf8″);
PREPARE stmt FROM #str;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SELECT ‘Table has been created’;
END$$
DELIMITER ;
———————————————–
Now you can execute this procedure to create a variable name table as per below-
call sp_variable_table();
You can check new table after executing below command-
use test;show tables like ‘%zafar%’; — test is here ‘database’ name.
You can also check more details at below path-
http://mydbsolutions.in/how-can-create-a-table-with-variable-name/