Mysql :: Mysql 5.7 Reference Manual :: 3.3.3 Loading Data Into A Table

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The mysql database is the system database. It contains tables that store information required by the MySQL server as it runs. Tables in the mysql database fall into these categories: This is the MySQL™ Reference Manual. It documents MySQL 8.0 through 8.0.22, as well as NDB Cluster releases based on version 8.0 of NDB through 8.0.21-ndb-8.0.21, respectively. It may include documentation of features of MySQL versions that have not yet been released. For information about which versions have been released, see the MySQL 8.0 Release Notes.

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For InnoDB tables, SHOW TABLE STATUS does not give accurate statistics except for the physical size reserved by the table. The row count is only a rough estimate used in SQL optimization. For NDB tables, the output of this statement shows appropriate values for the Avg_row_length and Data_length columns, with the exception that BLOB columns are not The harder part is deciding what the structure of your database should be: what tables you need and what columns should be in each of them. You want a table that contains a record for each of your pets. This can be called the pet table, and it should contain, as a bare minimum, each animal’s name. Because the name by itself is not very interesting, the table should contain To determine whether a statement requires a temporary table, use EXPLAIN and check the Extra column to see whether it says Using temporary (see Section 8.8.1, “Optimizing Queries with EXPLAIN”). EXPLAIN does not necessarily say Using temporary for derived or materialized temporary tables. Some query conditions prevent the use of an in-memory temporary table, in

The data type of SELECT columns can be overridden by also specifying the column in the CREATE TABLE part. If any errors occur while copying the data to the table, it is automatically dropped and not created. You can precede the SELECT by IGNORE or REPLACE to indicate how to handle rows that duplicate unique key values.

ALTER TABLE changes the structure of a table. For example, you can add or delete columns, create or destroy indexes, change the type of existing columns, or rename columns or the table itself. You can also change characteristics such as the storage engine used for the table or the table comment. Without –tab, mysqldump writes SQL statements to the standard output. This output consists of CREATE statements to create dumped objects (databases, tables, stored routines, and so forth), and INSERT statements to load data into tables. For columns that are read but not modified you need only the SELECT privilege (such as for a column referenced only on the right hand side of an col_name = expr assignment in an ON DUPLICATE KEY UPDATE clause). When inserting into a partitioned table, you can control which partitions and subpartitions accept new rows.

The mysqlimport utility provides another way to load data files; it operates by sending a LOAD DATA statement to the server. See Section 4.5.5, “mysqlimport — A Data Import Program”. For information about the efficiency of INSERT versus LOAD DATA and speeding up LOAD DATA, see Section 8.2.4.1, “Optimizing INSERT Statements”. ANALYZE TABLE with the UPDATE HISTOGRAM clause generates histogram statistics for the named table to indicate how to columns and stores them in the data dictionary. Only one table name is permitted with this syntax. MySQL also supports setting the histogram of If merging would result in an outer query block that references more than 61 base tables, the optimizer chooses materialization instead. The optimizer propagates an ORDER BY clause in a derived table or view reference to the outer query block if these conditions are all true:

REPAIR TABLE repairs a possibly corrupted table, for certain storage engines only. This statement requires SELECT and INSERT privileges for the table. Although normally you should never have to run REPAIR TABLE, if disaster strikes, this statement is very likely to get back all your data from a MyISAM table. Alternatively, you can use SELECT INTO OUTFILE or CREATE TABLE SELECT. You can use SELECT INTO with user-defined variables. The same syntax for partitioned can also be used inside stored routines using cursors and local variables. See Section 15.2.13.1, “SELECT Before running CHECK TABLE on InnoDB tables, see CHECK TABLE Usage Notes for InnoDB Tables. CHECK TABLE is supported for partitioned tables, and you can use ALTER TABLE CHECK PARTITION to check one or more partitions; for more information, see Section 15.1.9, “ALTER TABLE Statement”, and Section 26.3.4, “Maintenance of Partitions”.

MySQL :: MySQL 5.7 Reference Manual :: 5.1.10 Server SQL Modes

This manual describes features that are not included in every edition of MySQL 5.5; such features may not be included in the edition of MySQL 5.5 licensed to you. If you have any questions about the features included in your edition of MySQL 5.5, refer to your MySQL 5.5 license agreement or contact your Oracle sales representative. A generated column definition can refer to other generated columns, but only those occurring earlier in the table definition. A generated column definition can refer to any base (nongenerated) column in the table whether its definition occurs earlier or later. The AUTO_INCREMENT attribute cannot be used in a generated column definition. SQL mode and user-defined partitioning. Changing the server SQL mode after creating and inserting data into partitioned tables can cause major changes in the behavior of such tables, and could lead to loss or corruption of data. It is strongly recommended that you never change the SQL mode once you have created tables employing user-defined partitioning.

(PPT) A Guide to MySQL 3. 2 Objectives Start MySQL and learn how to use ...

3.1 Connecting to and Disconnecting from the Server.. 128 3.2 Entering Queries.. 129 3.3 Creating and Using a Database

Stop the mysqld server with mysqladmin shutdown, run myisamchk –silent –force */*.MYI from the data directory to check all MyISAM tables, and restart mysqld. MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which help keep the related data consistent. A foreign key relationship involves a parent table that holds the initial column values, and a child table with column values that reference the parent column values.

CREATE TABLE supports the specification of generated columns. Values of a generated column are computed from an expression included in the column definition. Generated columns are supported by the NDB storage engine beginning with MySQL NDB Cluster 7.5.3. The following simple example shows a table that stores the lengths of the sides of right triangles in the sidea Stop the mysqld server with mysqladmin shutdown, run myisamchk –silent –force */*.MYI from the data directory to check all MyISAM tables, and restart mysqld. InnoDB tables use a clustered index, which makes it relatively fast to use data in the order of the PRIMARY KEY. Performing bulk inserts in PRIMARY KEY order is particularly important for tables that do not fit entirely within the buffer pool. For optimal performance when loading data into an InnoDB FULLTEXT index, follow this set of steps:

MySQL Server does not support the SELECT INTO TABLE Sybase SQL extension. Instead, MySQL Server supports the INSERT INTO SELECT standard SQL syntax, which is basically the same thing. See Section 13.2.5.1, “INSERT SELECT Statement”. For example: MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which help keep the related data consistent. A foreign key relationship involves a parent table that holds the initial column values, and a child table with column values that reference the parent column values. This is the MySQL™ Reference Manual. It documents MySQL 5.6 through 5.6.48, as well as NDB Cluster releases based on versions 7.3 and 7.4 of NDB through 5.6.47-ndb-7.3.28 and 5.6.47-ndb-7.4.27, respectively. It may include documentation of features of MySQL versions that have not yet been released. For information about which versions have been released, see the

For more information, see Section 24.3.16, “The INFORMATION_SCHEMA PARTITIONS Table”. AUTO_INCREMENT The next AUTO_INCREMENT value. CREATE_TIME When the table was created. UPDATE_TIME When the data file was last updated. For some storage engines, this value is NULL. For example, InnoDB stores multiple tables in its system tablespace and the 5.3.3 Loading Data into a Table After creating your table, you need to populate it. The LOAD DATA and INSERT statements are useful for this. Suppose that your pet records can be described as shown here. (Observe that MySQL expects dates in ‚ YYYY-MM-DD ‚ format; this may differ from what you are used to.)

Abstract This is the MySQL™ Reference Manual. It documents MySQL 5.1 through 5.1.73, as well as MySQL Cluster releases based on versions 6.1, 6.2, 6.3, 7.0, and 7.1 of the NDB storage engine through 5.1.15-ndb-6.1.23, 5.1.51-ndb-6.2.19, 5.1.73-ndb-6.3.55, 5.1.73-ndb-7.0.42, and 5.1.77-ndb-7.1.37. End of Product Lifecycle. Active development for MySQL Database Server TABLE or ALTER TABLE statement, issue an ANALYZE TABLE statement to calculate the statistics, after loading representative data into the table. For more information about the persistent statistics feature, see Section 17.8.10.1,

MySQL Server provides flexible control over the destination of output written to the general query log and the slow query log, if those logs are enabled. Possible destinations through 5 for log entries are log files or the general_log and slow_log tables in the mysql system database. File output, table output, or both can be selected.

A given SELECT statement can contain at most one INTO clause, although as shown by the SELECT syntax description (see Section 15.2.13, “SELECT Statement”), the INTO can appear in different positions: This is the MySQL™ Reference Manual. It documents MySQL 5.5 through 5.5.8. MySQL Cluster is currently not supported in MySQL 5.5. For information about MySQL Cluster, please see MySQL Cluster NDB 6.X/7.X. MySQL 5.5 features This manual describes features that are not included in every edition of MySQL 5.5; such features may not be included in the edition of

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