create new table from existing table in mysql

1. Create a temporary tableA temporary table is a table, used to temporarily save some dataCharacteristics:Visible only to the user who created the temporary table ;When the session ends, MySQL automatically deletes the temporary table.The core of

SQL creates a new table from an existing table, the new table structure is the same as the existing table structure, but not the data in the existing table!The execution of DML statements depends on the database type:SQLITE-----Copy table structure

MySQL table sharding Methods: MySQL I. Let me explain why Table sharding is required. When a piece of data reaches several millions, it takes more time for you to query the data at a time. If there is a joint query, I think it may die there. The

MySQL creates a table and creates a . frm file to save the table and column definitions. The index is stored in one . MYI (Myindex) and the data is stored in the . MYD (MYData) file extension. First, using Show/describe statement to display the data

When creating a table, MySQL creates a. frm file to save the table and column definitions. Indexes are stored in a file with the. MYI (MYindex) Extension and data is stored in a file with the. MYD (MYData) extension. 1. Use the SHOW/DESCRIBE

The following articles mainly describe the creation and deletion of MySQL databases, as well as the detailed parsing of indexes and changing actual table statements. If you are also popular with MySQL databases, you can click the following article

database table Basic Operations After thinking, finally the name of the blog changed to the basic operation of the database table, formerly called the SQL statement Daquan, feeling with "Daquan" this noun is too big, and the

SQL Study Notes (14) ------------ data table, SQL statement for creating a data table Operations on Data TablesBasic Database OperationsWith MySQL, you can choose between the three basic database table formats (version 3.23. When creating a table,

MySQL when creating a table, create a . frm file to save the table and column definitions. The index is stored in a . MYI (myindex) file extension and data is stored in the . MYD (MYData) extension in the file. First, using Show/describe statement

ALTER TABLE Syntax ALTER [IGNORE] TABLE tbl_name alter_spec [, Alter_spec ...] Alter_specification:ADD [COLUMN] create_definition [i | After column_name]or ADD [COLUMN] (create_definition, create_definition,...)or ADD INDEX [index_name] (Index_col_