To drop multiple tables with a singleDROPstatement, do the following: DROP TABLE IF EXISTS table1, table2, table3;Copy TheIF EXISTSoption shows one warning astable1does not exist. Other tables are deleted. Note:Consider identifyingduplicate values in MySQL databasesand then deleting them to impr...
In this section, I will explain how to use MySQL DROP DATABASE statement to delete a database. Dropping or deleting a MySQL database is easy. The drop statement command is used when we have to no longer use one of the SQL databases on the server. It will remove permanently and is ver...
Optional. It has no impact or effect on the DROP TABLE statement but is included in the syntax to make porting the tables to different databases easier. Note If you use the MySQL DROP TABLE statement to drop one or more tables that do not exist, the database will raise an error (unless...
it deletes the entire records as well as the schema and structure of the table along with its named elements. The DROP command is a Data Definition Language (DDL) command. In addition, this command can also be used to drop databases. Databases or tables once dropped are wiped out of exis...
In databases, rows are persisted on disk and for every row, columns' value are stored on disk. Now, if a new column is to be added or an old column is to be dropped from a table, the contents of existing rows should be changed to reflect the correct values of columns present in th...
To prevent this type of error from happening, some databases such as MySQL and Oracle allow an optional "IF EXISTS" phrase between DROP TABLE and the table name(s). This tells the database to execute the DROP TABLE statement only if the table to be dropped already exists. If the table ...
DROPDATABASEdatabase_nameCode language:SQL (Structured Query Language)(sql) Some database management systems, such as Microsoft SQL Server or MySQL, allow you to drop multiple databases using a singleDROP DATABASEstatement. To remove multiple databases, you specify a list of comma-separated databa...
You can also drop databases withmysqladmin. SeeSection 6.5.2, “mysqladmin — A MySQL Server Administration Program”.
MySQL 5.1.45-Community w InnoDB databases To continue testing new procedures and triggers on the "real" database I stopped MySQL and took the InnoDB database, the logs and copied it according to manuals, and also copied the .FRM file. All of this went into my development computer... ...
Often during data migration you need to recreate a parent table and reload its data from Oracle to MySQL. The problem that this table already exists in MySQL and has child tables that have foreign keys to the parent table. Let's assume MySQL has the fol