How can I get data from chosen table of my database?
I'm going to work with database in c# application and I have the database includes that tables:
MyTable1;
MyTable2;
...
And I have tbl variable that is equal to tbl = "MyTable2";. I want to execute the code as following:select * from tbl
I try to execute this code:
SELECT *
FROM (
SELECT TABLE_NAME
FROM information_schema.tables
WHERE TABLE_NAME = 'MyTable1'
);
But the code returned error that Every derived table must have its own alias
I want to get all data from table whose name is equal to my variable (tbl) and its value can also be changed. How can I do it?
You might be able to do this using a prepared statement in MySQL:
SELECT TABLE_NAME
INTO #table
FROM information_schema.tables
WHERE TABLE_NAME = 'MyTable1';
SET #query = CONCAT('SELECT * FROM ', #table);
PREPARE stmt FROM #query;
EXECUTE stmt;
SELECT *
FROM (
SELECT TABLE_NAME
FROM information_schema.tables
WHERE TABLE_NAME = 'MyTable1'
) AS Blah
Try this:
DECLARE #SELECT nvarchar(500)
SET #SELECT = 'SELECT * FROM ' + #tbl
EXECUTE sp_executesql #SELECT
Is there a way to pass an array into a MySQL query and return the results as another array ?(apart from using cursors which would be an overkill for my use case)
For a single id, my query looks like this.
SET #userId = '04b452cd59dcc656'
Select user_account_number from userstore where u_id = #userId ;
Instead of sending each id at a time, I am trying to send a list and return a list
SET #userId = ('04b452cd59dcc656','eqwe52cddasfsd656');
<query returning the list of account numbers>
Also - I think this would be efficient over just sending one id at a time. Thoughts ?
You can use IN:
select user_account_number
from userstore
where u_id in ('04b452cd59dcc656', 'eqwe52cddasfsd656') ;
Using variables is trickier. If you know a maximum number, you can do:
select user_account_number
from userstore
where u_id in (#id1, #id2);
Not satisfying, but it does the job. Similarly unsatisfying is FIND_IN_SET():
set #ids = '04b452cd59dcc656,eqwe52cddasfsd656';
select user_account_number
from userstore
where find_in_set(u_id, #ids) > 0;
Alas, this won't use an index.
Finally there is dynamic SQL:
set #sql = concat('select user_account_number from userstore where u_id in (''',
replace(ids, ',', ''','''),
''')'
);
prepare s from #sql;
execute s;
Can you use an mysql #variable in WHERE IN clause ?
I tried this:
SET #inlist =
(
SELECT GROUP_CONCAT(product_id) FROM products WHERE `status` = "new"
);
SELECT #inlist; -- shows comma separated values;
SELECT * from products where product_id IN (SELECT #inlist);
will only return the first product in the list.
I know there is a default 1k limit on GROUP_CONCAT.
You can do it with dynamic SQL:
PREPARE stmt FROM CONCAT('SELECT * from products where product_id IN (', #inlist, ')');
EXECUTE stmt;
If you need to do this frequently, you could put it in a stored procedure, and then just do:
CALL yourProc(#inlist);
try this with FIND_IN_SET
SELECT * from products where FIND_IN_SET(product_id , #inlist );
I have a stored procedure that looks like below Pseudo:
create procedure composite(IN a varchar(255),IN b varchar(255),IN c datetime,IN d datetime)
begin
DECLARE str VARCHAR(255);
DECLARE count float;
SET str = '';
SET str = CONCAT("aname like '%",a,"%' "," and bname ='",b,"' ");
set #comp = CONCAT("SELECT * from abc where ",str, "GROUP BY qname");
PREPARE stmt FROM #comp;
EXECUTE stmt;
set count = found_rows();
SET STR1 = CONCAT("aname like '%",a,"%' "," and bname ='",b,"' ");
SET #sql = CONCAT("SELECT * from xyz",str,"GROUP BY DATE(FROM_UNIXTIME(abcdate)),qname");
PREPARE stmt FROM #sql;
EXECUTE stmt;
end//
When I execute this i get 2 result-sets as output i.e. from executing 2 select statement. I want the output of only last select. Is there any way to do this?
Do not quite understand what you want to do. I imagine that the stored procedure is not complete.
Is it really necessary to use prepared statements in this case? Do you need to count as float?
Maybe something like this might be useful:
...
DECLARE count BIGINT UNSIGNED;
SELECT COUNT(*) INTO count /* Here you can use a user variable (#count) and avoiding the local variable (count) */
FROM (
SELECT 0
FROM abc
WHERE aname LIKE CONCAT('%', a, '%') AND bname = b
GROUP BY qname
) der;
SELECT aname, bname, qname
FROM xyz
WHERE aname LIKE CONCAT('%', a, '%') AND bname = b
GROUP BY qname;
...
The first statement will store the number of rows in the local variable count and will not return the dataset. Beware of variable names and reserved words, in this case count is allowed, but read 9.3. Reserved Words in the documentation.
I am converting all my SQL Server queries to MySQL and my queries that have WITH in them are all failing. Here's an example:
WITH t1 AS
(
SELECT article.*, userinfo.*, category.*
FROM question
INNER JOIN userinfo ON userinfo.user_userid = article.article_ownerid
INNER JOIN category ON article.article_categoryid = category.catid
WHERE article.article_isdeleted = 0
)
SELECT t1.*
FROM t1
ORDER BY t1.article_date DESC
LIMIT 1, 3
MySQL prior to version 8.0 doesn't support the WITH clause (CTE in SQL Server parlance; Subquery Factoring in Oracle), so you are left with using:
TEMPORARY tables
DERIVED tables
inline views (effectively what the WITH clause represents - they are interchangeable)
The request for the feature dates back to 2006.
As mentioned, you provided a poor example - there's no need to perform a subselect if you aren't altering the output of the columns in any way:
SELECT *
FROM ARTICLE t
JOIN USERINFO ui ON ui.user_userid = t.article_ownerid
JOIN CATEGORY c ON c.catid = t.article_categoryid
WHERE t.published_ind = 0
ORDER BY t.article_date DESC
LIMIT 1, 3
Here's a better example:
SELECT t.name,
t.num
FROM TABLE t
JOIN (SELECT c.id
COUNT(*) 'num'
FROM TABLE c
WHERE c.column = 'a'
GROUP BY c.id) ta ON ta.id = t.id
Mysql Developers Team announced that version 8.0 will have Common Table Expressions in MySQL (CTEs). So it will be possible to write queries like this:
WITH RECURSIVE my_cte AS
(
SELECT 1 AS n
UNION ALL
SELECT 1+n FROM my_cte WHERE n<10
)
SELECT * FROM my_cte;
+------+
| n |
+------+
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 8 |
| 9 |
| 10 |
+------+
10 rows in set (0,00 sec)
In Sql the with statement specifies a temporary named result set, known as a common table expression (CTE). It can be used for recursive queries, but in this case, it specifies as subset. If mysql allows for subselectes i would try
select t1.*
from (
SELECT article.*,
userinfo.*,
category.*
FROM question INNER JOIN
userinfo ON userinfo.user_userid=article.article_ownerid INNER JOIN category ON article.article_categoryid=category.catid
WHERE article.article_isdeleted = 0
) t1
ORDER BY t1.article_date DESC Limit 1, 3
I followed the link shared by lisachenko and found another link to this blog:
http://guilhembichot.blogspot.co.uk/2013/11/with-recursive-and-mysql.html
The post lays out ways of emulating the 2 uses of SQL WITH. Really good explanation on how these work to do a similar query as SQL WITH.
1) Use WITH so you don't have to perform the same sub query multiple times
CREATE VIEW D AS (SELECT YEAR, SUM(SALES) AS S FROM T1 GROUP BY YEAR);
SELECT D1.YEAR, (CASE WHEN D1.S>D2.S THEN 'INCREASE' ELSE 'DECREASE' END) AS TREND
FROM
D AS D1,
D AS D2
WHERE D1.YEAR = D2.YEAR-1;
DROP VIEW D;
2) Recursive queries can be done with a stored procedure that makes the call similar to a recursive with query.
CALL WITH_EMULATOR(
"EMPLOYEES_EXTENDED",
"
SELECT ID, NAME, MANAGER_ID, 0 AS REPORTS
FROM EMPLOYEES
WHERE ID NOT IN (SELECT MANAGER_ID FROM EMPLOYEES WHERE MANAGER_ID IS NOT NULL)
",
"
SELECT M.ID, M.NAME, M.MANAGER_ID, SUM(1+E.REPORTS) AS REPORTS
FROM EMPLOYEES M JOIN EMPLOYEES_EXTENDED E ON M.ID=E.MANAGER_ID
GROUP BY M.ID, M.NAME, M.MANAGER_ID
",
"SELECT * FROM EMPLOYEES_EXTENDED",
0,
""
);
And this is the code or the stored procedure
# Usage: the standard syntax:
# WITH RECURSIVE recursive_table AS
# (initial_SELECT
# UNION ALL
# recursive_SELECT)
# final_SELECT;
# should be translated by you to
# CALL WITH_EMULATOR(recursive_table, initial_SELECT, recursive_SELECT,
# final_SELECT, 0, "").
# ALGORITHM:
# 1) we have an initial table T0 (actual name is an argument
# "recursive_table"), we fill it with result of initial_SELECT.
# 2) We have a union table U, initially empty.
# 3) Loop:
# add rows of T0 to U,
# run recursive_SELECT based on T0 and put result into table T1,
# if T1 is empty
# then leave loop,
# else swap T0 and T1 (renaming) and empty T1
# 4) Drop T0, T1
# 5) Rename U to T0
# 6) run final select, send relult to client
# This is for *one* recursive table.
# It would be possible to write a SP creating multiple recursive tables.
delimiter |
CREATE PROCEDURE WITH_EMULATOR(
recursive_table varchar(100), # name of recursive table
initial_SELECT varchar(65530), # seed a.k.a. anchor
recursive_SELECT varchar(65530), # recursive member
final_SELECT varchar(65530), # final SELECT on UNION result
max_recursion int unsigned, # safety against infinite loop, use 0 for default
create_table_options varchar(65530) # you can add CREATE-TABLE-time options
# to your recursive_table, to speed up initial/recursive/final SELECTs; example:
# "(KEY(some_column)) ENGINE=MEMORY"
)
BEGIN
declare new_rows int unsigned;
declare show_progress int default 0; # set to 1 to trace/debug execution
declare recursive_table_next varchar(120);
declare recursive_table_union varchar(120);
declare recursive_table_tmp varchar(120);
set recursive_table_next = concat(recursive_table, "_next");
set recursive_table_union = concat(recursive_table, "_union");
set recursive_table_tmp = concat(recursive_table, "_tmp");
# Cleanup any previous failed runs
SET #str =
CONCAT("DROP TEMPORARY TABLE IF EXISTS ", recursive_table, ",",
recursive_table_next, ",", recursive_table_union,
",", recursive_table_tmp);
PREPARE stmt FROM #str;
EXECUTE stmt;
# If you need to reference recursive_table more than
# once in recursive_SELECT, remove the TEMPORARY word.
SET #str = # create and fill T0
CONCAT("CREATE TEMPORARY TABLE ", recursive_table, " ",
create_table_options, " AS ", initial_SELECT);
PREPARE stmt FROM #str;
EXECUTE stmt;
SET #str = # create U
CONCAT("CREATE TEMPORARY TABLE ", recursive_table_union, " LIKE ", recursive_table);
PREPARE stmt FROM #str;
EXECUTE stmt;
SET #str = # create T1
CONCAT("CREATE TEMPORARY TABLE ", recursive_table_next, " LIKE ", recursive_table);
PREPARE stmt FROM #str;
EXECUTE stmt;
if max_recursion = 0 then
set max_recursion = 100; # a default to protect the innocent
end if;
recursion: repeat
# add T0 to U (this is always UNION ALL)
SET #str =
CONCAT("INSERT INTO ", recursive_table_union, " SELECT * FROM ", recursive_table);
PREPARE stmt FROM #str;
EXECUTE stmt;
# we are done if max depth reached
set max_recursion = max_recursion - 1;
if not max_recursion then
if show_progress then
select concat("max recursion exceeded");
end if;
leave recursion;
end if;
# fill T1 by applying the recursive SELECT on T0
SET #str =
CONCAT("INSERT INTO ", recursive_table_next, " ", recursive_SELECT);
PREPARE stmt FROM #str;
EXECUTE stmt;
# we are done if no rows in T1
select row_count() into new_rows;
if show_progress then
select concat(new_rows, " new rows found");
end if;
if not new_rows then
leave recursion;
end if;
# Prepare next iteration:
# T1 becomes T0, to be the source of next run of recursive_SELECT,
# T0 is recycled to be T1.
SET #str =
CONCAT("ALTER TABLE ", recursive_table, " RENAME ", recursive_table_tmp);
PREPARE stmt FROM #str;
EXECUTE stmt;
# we use ALTER TABLE RENAME because RENAME TABLE does not support temp tables
SET #str =
CONCAT("ALTER TABLE ", recursive_table_next, " RENAME ", recursive_table);
PREPARE stmt FROM #str;
EXECUTE stmt;
SET #str =
CONCAT("ALTER TABLE ", recursive_table_tmp, " RENAME ", recursive_table_next);
PREPARE stmt FROM #str;
EXECUTE stmt;
# empty T1
SET #str =
CONCAT("TRUNCATE TABLE ", recursive_table_next);
PREPARE stmt FROM #str;
EXECUTE stmt;
until 0 end repeat;
# eliminate T0 and T1
SET #str =
CONCAT("DROP TEMPORARY TABLE ", recursive_table_next, ", ", recursive_table);
PREPARE stmt FROM #str;
EXECUTE stmt;
# Final (output) SELECT uses recursive_table name
SET #str =
CONCAT("ALTER TABLE ", recursive_table_union, " RENAME ", recursive_table);
PREPARE stmt FROM #str;
EXECUTE stmt;
# Run final SELECT on UNION
SET #str = final_SELECT;
PREPARE stmt FROM #str;
EXECUTE stmt;
# No temporary tables may survive:
SET #str =
CONCAT("DROP TEMPORARY TABLE ", recursive_table);
PREPARE stmt FROM #str;
EXECUTE stmt;
# We are done :-)
END|
delimiter ;
'Common Table Expression' feature is not available in MySQL, so you have to go to make a view or temporary table to solve, here I have used a temporary table.
The stored procedure mentioned here will solve your need. If I want to get all my team members and their associated members, this stored procedure will help:
----------------------------------
user_id | team_id
----------------------------------
admin | NULL
ramu | admin
suresh | admin
kumar | ramu
mahesh | ramu
randiv | suresh
-----------------------------------
Code:
DROP PROCEDURE `user_hier`//
CREATE DEFINER=`root`#`localhost` PROCEDURE `user_hier`(in team_id varchar(50))
BEGIN
declare count int;
declare tmp_team_id varchar(50);
CREATE TEMPORARY TABLE res_hier(user_id varchar(50),team_id varchar(50))engine=memory;
CREATE TEMPORARY TABLE tmp_hier(user_id varchar(50),team_id varchar(50))engine=memory;
set tmp_team_id = team_id;
SELECT COUNT(*) INTO count FROM user_table WHERE user_table.team_id=tmp_team_id;
WHILE count>0 DO
insert into res_hier select user_table.user_id,user_table.team_id from user_table where user_table.team_id=tmp_team_id;
insert into tmp_hier select user_table.user_id,user_table.team_id from user_table where user_table.team_id=tmp_team_id;
select user_id into tmp_team_id from tmp_hier limit 0,1;
select count(*) into count from tmp_hier;
delete from tmp_hier where user_id=tmp_team_id;
end while;
select * from res_hier;
drop temporary table if exists res_hier;
drop temporary table if exists tmp_hier;
end
This can be called using:
mysql>call user_hier ('admin')//
That feature is called a common table expression
http://msdn.microsoft.com/en-us/library/ms190766.aspx
You won't be able to do the exact thing in mySQL, the easiest thing would to probably make a view that mirrors that CTE and just select from the view. You can do it with subqueries, but that will perform really poorly. If you run into any CTEs that do recursion, I don't know how you'd be able to recreate that without using stored procedures.
EDIT:
As I said in my comment, that example you posted has no need for a CTE, so you must have simplified it for the question since it can be just written as
SELECT article.*, userinfo.*, category.* FROM question
INNER JOIN userinfo ON userinfo.user_userid=article.article_ownerid
INNER JOIN category ON article.article_categoryid=category.catid
WHERE article.article_isdeleted = 0
ORDER BY article_date DESC Limit 1, 3
I liked #Brad's answer from this thread, but wanted a way to save the results for further processing (MySql 8):
-- May need to adjust the recursion depth first
SET ##cte_max_recursion_depth = 10000 ; -- permit deeper recursion
-- Some boundaries
set #startDate = '2015-01-01'
, #endDate = '2020-12-31' ;
-- Save it to a table for later use
drop table if exists tmpDates ;
create temporary table tmpDates as -- this has to go _before_ the "with", Duh-oh!
WITH RECURSIVE t as (
select #startDate as dt
UNION
SELECT DATE_ADD(t.dt, INTERVAL 1 DAY) FROM t WHERE DATE_ADD(t.dt, INTERVAL 1 DAY) <= #endDate
)
select * FROM t -- need this to get the "with"'s results as a "result set", into the "create"
;
-- Exists?
select * from tmpDates ;
Which produces:
dt |
----------|
2015-01-01|
2015-01-02|
2015-01-03|
2015-01-04|
2015-01-05|
2015-01-06|