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i've created that "data" folder, and run init command.. there was no problem...
but when testing connection, the problem still the same, i.e. below pic..
error connection[^]
know how to fix it?
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The message is self-explanatory: one or more of the IP address, port, userid or password are not valid. Check all your settings.
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one or more of the IP address, port, userid or password are not valid.
??
where did you see this message..? it's not in anything in the picture i shared...
the error msg is:
Failed connect to MySQL bla bla bla...
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The message lists all the values it is trying to use to connect. So it is reasonably safe to assume that one or more of them is not correct. That is the only information you have to work with, so you need to investigate further to discover which one it is.
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Hello database experts,
In SQL Server is an option to update statistics before detaching a database, both using Transact-SQL and management studio wizard.
The purpose and advantage of updating statistics is clear.
My question is that, why should we update statistics before detaching a database? Is there any performance issue in recovery of database while attaching? or something else?
SignatureNotFoundException
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Hello
My query to get a ranked leaderboard works on MYSQL 5.7 but gives me errors now that I upgraded to MYSQL 8.0
mysql> SELECT username,score,level, FIND_IN_SET(score,(SELECT GROUP_CONCAT(score ORDER BY score ASC)FROM highscore WHERE game = 0 AND level = 4 AND user = 10 )) AS rank FROM highscore WHERE game = 0 AND level = 4 AND user = 1 ORDER BY rank LIMIT 10;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax
to use near 'rank FROM highscore WHERE game = 0 AND level = 4 AND user = 1 ORDER BY rank LIMI' at line 1
Any ideas?
Thank you Team!
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Thank you so much.
Simply changed "rank" to "ranklist" and it has resolved the issue.
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Perhaps you should get together with your classmate / colleague:
I need to generate rank in mysql v5.7.31[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I am familiar with SQL Server Activity Monitor. What all I know about it, have been learned by my own experinced. I decided to learn all details about it, and googled many keywords but most of results were a brief. I did not find a comprehensive article or document in detail.
Can anyone send me a well documented link?
For example the task states vary in different articles; Or what head blocker value is (the concept is clear but not the value; I thouth it is SPID but is not)?
SignatureNotFoundException
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After some extra research I found a complete list of state from different sources:
Running - The session is running one or more batches. When Multiple Active Result Sets (MARS) is enabled, a session can run multiple batches. For more information, see Using Multiple Active Result Sets (MARS).
Background - The session is running a background task, such as deadlock detection.
Rollback - The session has a transaction rollback in the process.
Pending - The session is waiting for a worker thread to become available.
Runnable - The session's task is in the runnable queue of a scheduler while waiting to get a time quantum.
Spinloop - The session's task is waiting for a spinlock to become free.
Suspended - The session is waiting for an event, such as I/O, to complete.
Sleeping - A session in the sleeping state means a client connection without an active query.
Dormant - SQL Server is resetting the session. Same as Sleeping, except Dormant also indicates that the SPID has been reset after completing an RPC event. (Replication SPIDs show "DORMANT" when waiting.)
For more information about other columns see:
SQL Server Activity Monitor
I hope it helps others.
SignatureNotFoundException
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I need to get all database names, using SQL script only. I have tried:
SELECT datname FROM pg_database WHERE datistemplate = false and seem to work. I got:
mydb1
mydb2
postgres
mybd1 and mydb2 have been created by me. So far, so good. Now, I need to find all tables under every database, using SQL script only. Is it possible ?
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Thank you Victor. Obviosly, I don't understand something: if I do:
create database mydb3
and then I want to create a table under that db, how can I do that ?
Because any (dummy) table I create, seem to be any no database inside ...
P.S. I saw (and tried) that link ... thanks anyway.
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Hello Victor. As far as I understood, "use ..." is not valid command in Postgre SQL ... I have tried that.
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_Flaviu wrote: As far as I understood, "use ..." is not valid command in Postgre SQL
I know.
But did you try the
\connect
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That command is a Postgre SQL cmd line command, I cannot run it as SQL script, I have tried that.
Thank you.
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If you are not using psql then how are you running your SQL?
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Is about a C++ ODBC class which can run SQL scripts only.
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SELECT TABLE_NAME, TABLE_NAME FROM INFORMATION_SCHEMA.TABLES T WHERE T.TABLE_CATALOG=$dbname AND T.TABLE_SCHEMA='public';
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Get create table statements for a database under a schema.
<pre lang="SQL"> SELECT TABLE_NAME, 'CREATE TABLE '||TABLE_NAME|| ' ('||STRING_AGG(CONCAT( C1, C2, C3, C4, C5, C6 ),', ')||')' AS QUERY FROM ( SELECT C.TABLE_NAME, '"'||C.COLUMN_NAME||'"' || ' ' || CASE WHEN DATA_TYPE='ARRAY' THEN LTRIM(UDT_NAME,'_')||'[]' ELSE DATA_TYPE END AS C1, CASE WHEN CHARACTER_MAXIMUM_LENGTH > 0 THEN '(' || CHARACTER_MAXIMUM_LENGTH || ')' END AS C2, CASE WHEN NUMERIC_PRECISION > 0 AND NUMERIC_SCALE < 1 THEN NULL END AS C3, CASE WHEN NUMERIC_PRECISION > 0 AND NUMERIC_SCALE > 0 THEN NULL END AS C4, CASE WHEN IS_NULLABLE = 'NO' THEN ' NOT NULL' END AS C5, CASE WHEN COLUMN_DEFAULT IS NOT NULL AND COLUMN_DEFAULT NOT LIKE 'nextval%' THEN ' DEFAULT' END || ' ' || REPLACE(COLUMN_DEFAULT, '::CHARACTER VARYING', '') AS C6 FROM INFORMATION_SCHEMA.COLUMNS C, INFORMATION_SCHEMA.TABLES T WHERE C.TABLE_CATALOG='tpch' AND T.TABLE_CATALOG='tpch' AND T.TABLE_SCHEMA='public' AND C.TABLE_NAME=T.TABLE_NAME AND C.TABLE_SCHEMA='public' AND T.TABLE_TYPE IN ('BASE TABLE') ORDER BY C.TABLE_NAME, C.ORDINAL_POSITION ) AS STRING_COLUMNS GROUP BY TABLE_NAME
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Yes, I have tried:
SELECT *
FROM pg_catalog.pg_tables
WHERE schemaname != 'pg_catalog' AND
schemaname != 'information_schema';
but this script doesn't take into account a specific database. I don't understand how is relation between database and table, in Postgre SQL ...
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