Type the following command to import sql data file: $ mysql -u username -p -h localhost DATA-BASE-NAME < data.sql In this example, import ‘data.sql’ file into ‘blog’ database using vivek as username: $ mysql -u vivek -p -h localhost blog < data.sql If you have a dedicated database server, replace localhost hostname with with actual … Read more
You can do this: SELECT ser.id, ser.name, s.status, s.timestamp FROM Service ser INNER JOIN status as s ON s.service_id = ser.id INNER JOIN ( SELECT service_id, MAX(timestamp) AS MaxDate FROM status GROUP BY service_id ) AS a ON a.service_id = s.service_id AND a.MaxDate = s.timestamp; The join with the subquery: SELECT service_id, MAX(timestamp) AS MaxDate … Read more
According to this link, you shouldn’t mix up both notations when building up joins. The comma you are using to join memebers as m, telephone as t, and the subsequent calls to inner join, are triggering the unknown column error. To deal with it, use CROSS/INNER/LEFT JOIN instead of commas. Previously, the comma operator (,) … Read more
You need to escape reserved words like order with backticks CREATE TABLE `order` ( … or better use another name instead.
From the docs: Identifiers may begin with a digit but unless quoted may not consist solely of digits. Which means you must quote it with back ticks like `25`: UPDATE table SET `25`=’100′ WHERE id=’1′
I restored the table from only .frm and .idb files. Get the SQL query to create the tables If you already know the schema of your tables, you can skip this step. First, install MySQL Utilities. Then you can use mysqlfrm command in command prompt (cmd). Second, get the SQL queries from .frm files using … Read more
I can think of four possible workarounds for your scenario: use fully-qualified-table-names when querying for the external table. MySQL supports the dbname.tablename-syntax to access tables outside the current database scope. This requires that the currently connected user has the appropriate rights to read from the requested table in another physical db. if your external database … Read more
This function does the job of only returning the digits 0-9 from the string, which does the job nicely to solve your issue, regardless of what prefixes or postfixes you have. http://www.artfulsoftware.com/infotree/queries.php?&bw=1280#815 Copied here for reference: SET GLOBAL log_bin_trust_function_creators=1; DROP FUNCTION IF EXISTS digits; DELIMITER | CREATE FUNCTION digits( str CHAR(32) ) RETURNS CHAR(32) BEGIN … Read more
Try this SELECT * FROM table_name ORDER BY CAST(field_name as SIGNED INTEGER) ASC
Your closest direct approximation is a join with a correlated sub-query as the predicate. SELECT ORD.ID ,ORD.NAME ,ORD.DATE ,ORD_HISTORY.VALUE FROM ORD INNER JOIN ORD_HISTORY ON ORD_HISTORY.<PRIMARY_KEY> = (SELECT ORD_HISTORY.<PRIMARY_KEY> FROM ORD_HISTORY WHERE ORD.ID = ORD_HISTORY.ID AND ORD.DATE <= ORD_HISTORY.DATE ORDER BY ORD_HISTORY.DATE DESC LIMIT 1 ) In your case, however, you only need one field … Read more