Mysql schema information table

INFORMATION_SCHEMA provides access to database metadata, information about the MySQL server such as the name of a database or table , the data type of a column, or access privileges. Other terms that are sometimes used for this information are data dictionary and system catalog. The TABLES table provides information about tables in databases. The INFORMATION_SCHEMA SCHEMATA Table A schema is a database, so the SCHEMATA table provides information about databases.

The comment used when creating the table (or information as to why MySQL could not access the table information ). Notes 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 taken into account. TABLES view allows you to get information about all tables and views within a database. By default it will show you this information for every single table and view that is in the database. For anybody reading the question the other way try. SELECT ` table _ schema ` FROM ` information _ schema `. How to find all the tables.

I just dont understand one thing. When I type: SELECT table _name FROM INFORMATION _ SCHEMA. Ask Question Asked years, months ago. Viewed 477k times 813. I have 2-different column names that I want to look up in the entire DB and list out all tables.

To see indexes for all tables within a specific schema you can use the STATISTICS table from INFORMATION _ SCHEMA : SELECT DISTINCT TABLE _NAME, INDEX_NAME FROM INFORMATION _ SCHEMA. Accuracy: Only an approximation. If the table is the target of frequent inserts and deletes, the result can be way off the actual count.

You can substitute the keyword SCHEMA instead of DATABASE in MySQL SQL syntax, for example using CREATE SCHEMA instead of CREATE DATABASE. Some other database products draw a distinction. For example, in the Oracle Database product, a schema represents only a part of a database: the tables and other objects owned by a single user.

COLUMNS テーブルを参照すれば確認出来る。 SELECT TABLE _NAME , COLUMN_NAME , COLUMN_TYPE , IS_NULLABLE , COLUMN_KEY , COLUMN_DEFAULT , EXTRA FROM INFORMATION _ SCHEMA. Finde Sql Schulung Jetzt bei Kensaq. nach Sql Schulung. Support for Open Source. Discover More Options.

Free Credit for Days. Grow Your SaaS Business. Engage with Other Users. MySQL inspects with default schemas which are information schema , performance schema , and sys.

The tables here are stored in the memory storage engine. You have a performance MySQL schema which acts as a storage engine that operates on a table under a schema database. Short answer: To show the schema for a MySQL database table , use the MySQL desc command. All tables in the INFORMATION _ SCHEMA database are stored directly in memory as MEMORY storage engine tables. They are totally internal to MySQL , so the.

In my answer, I first showed the table layout of INFORMATION _ SCHEMA. It is a temporary table in memory. Microsoft SQL Server provides an information schema view as one of several methods for obtaining this metadata.

The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party. TABLE _ SCHEMA にデータベース名、 TABLE _NAMEにテーブル. MySQL 系统自带的数据库，它提供了数据库元数据的访问方式。感觉 information _ schema 就像是 MySQL 实例的一个百科全书，记录了数据库当中大部.

Information _ schema TABLES.