Search results
Nov 10, 2014 · If I DELETE all rows and then repopulate the table (1million rows), a typical query takes 1s to come back. If instead I TRUNCATE the table, and repopulate it in exactly the same way, a typical query takes 0.05s to come back. YMMV, but for whatever reason for me on MariaDB 10.3.15-MariaDB-log DELETE seems to be ruining my index.
2. TRUNCATE TABLE table_name. Is a DDL (Data Definition Language), you can delete all data and clean identity. If you want to use this, you need DDL privileges in table. DDL statements example: CREATE, ALTER, DROP, TRUNCATE, etc. DELETE FROM table_name / DELETE FROM table_name WHERE 1=1 (is the same) Is a DML (Data Manipulation Language), you ...
Mar 28, 2018 · 2) add a constraint on the duplicated columns AND the new column. alter table mytable add constraint preventdupe unique (mycol1, mycol2, tokeep); 3) set the boolean column to true. This will succeed only on one of the duplicated rows because of the new constraint. update ignore mytable set tokeep = true;
The quick fix is to add SET SQL_SAFE_UPDATES=0; before your query : SET SQL_SAFE_UPDATES=0; Or. close the safe update mode. Edit -> Preferences -> SQL Editor -> SQL Editor remove Forbid UPDATE and DELETE statements without a WHERE clause (safe updates) . BTW you can use TRUNCATE TABLE tablename; to delete all the records .
May 25, 2017 · I had a use case of deleting 1M+ rows in the 25M+ rows Table in the MySQL. Tried different approaches like batch deletes (described above). I've found out that the fastest way (copy of required records to new table): Create Temporary Table that holds just ids. CREATE TABLE id_temp_table ( temp_id int);
Dec 20, 2012 · Here's a working example. Note that the COLUMN keyword is optional, as MySQL will accept just DROP IsDeleted. Also, to drop multiple columns, you have to separate them by commas and include the DROP for each one. ALTER TABLE tbl_Country. DROP COLUMN IsDeleted, DROP COLUMN CountryName; This allows you to DROP, ADD and ALTER multiple columns on ...
Simply drag and drop the table from the Catalog Tree to the Design area. Then you will see the table gets inserted there. From there, right-click on the table and select delete table. Then the table will get deleted from the whole project (assuming correspondent objects which are needed deleting as well).
There is another solution, if you have binary logs active on your server you can use mysqlbinlog. generate a sql file with it. mysqlbinlog binary_log_file > query_log.sql. then search for your missing rows. If you don't have it active, no other solution. Make backups next time. answered Aug 3, 2011 at 10:15. Mihai Iorga.
Mar 17, 2009 · Since you are selecting multiple tables, The table to delete from is no longer unambiguous. You need to select: DELETE posts FROM posts. INNER JOIN projects ON projects.project_id = posts.project_id. WHERE projects.client_id = :client_id. In this case, table_name1 and table_name2 are the same table, so this will work: DELETE projects FROM posts ...
Feb 18, 2019 · 1. Create an empty copy of the table (keys and all). INSERT...SELECT the data you want to preserve from the original into the copy. Remove any foreign key constraints referencing the original table. DROP the original table. RENAME the copy to the original's name. Recreate any foreign keys dropped in step 3.
