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小編給大家分享一下mysql怎樣查詢所有表和字段信息,希望大家閱讀完這篇文章后大所收獲,下面讓我們一起去探討吧!
mysql查詢所有表和字段信息的方法:1、根據(jù)庫名獲取所有表的信息【information_schema.`TABLES`】;2、根據(jù)庫名獲取所有的字段信息【ORDINAL_POSITION AS '列的排列順序'】。
mysql查詢所有表和字段信息的方法:
1、根據(jù)庫名獲取所有表的信息
SELECT * FROM information_schema.`TABLES` WHERE TABLE_SCHEMA = 'erp';
2、根據(jù)庫名獲取所有表名稱和表說明
SELECT TABLE_NAME, TABLE_COMMENT FROM information_schema.`TABLES` WHERE TABLE_SCHEMA = 'erp';
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3、根據(jù)庫名獲取所有的字段信息
SELECT TABLE_SCHEMA AS '庫名', TABLE_NAME AS '表名', COLUMN_NAME AS '列名', ORDINAL_POSITION AS '列的排列順序', COLUMN_DEFAULT AS '默認(rèn)值', IS_NULLABLE AS '是否為空', DATA_TYPE AS '數(shù)據(jù)類型', CHARACTER_MAXIMUM_LENGTH AS '字符最大長度', NUMERIC_PRECISION AS '數(shù)值精度(最大位數(shù))', NUMERIC_SCALE AS '小數(shù)精度', COLUMN_TYPE AS 列類型, COLUMN_KEY 'KEY', EXTRA AS '額外說明', COLUMN_COMMENT AS '注釋' FROM information_schema.`COLUMNS` WHERE TABLE_SCHEMA = 'erp' ORDER BY TABLE_NAME, ORDINAL_POSITION;
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4、根據(jù)庫名獲取所有的庫和表字段的基本信息
SELECT C.TABLE_SCHEMA AS '庫名', T.TABLE_NAME AS '表名', T.TABLE_COMMENT AS '表注釋', C.COLUMN_NAME AS '列名', C.COLUMN_COMMENT AS '列注釋', C.ORDINAL_POSITION AS '列的排列順序', C.COLUMN_DEFAULT AS '默認(rèn)值', C.IS_NULLABLE AS '是否為空', C.DATA_TYPE AS '數(shù)據(jù)類型', C.CHARACTER_MAXIMUM_LENGTH AS '字符最大長度', C.NUMERIC_PRECISION AS '數(shù)值精度(最大位數(shù))', C.NUMERIC_SCALE AS '小數(shù)精度', C.COLUMN_TYPE AS 列類型, C.COLUMN_KEY 'KEY', C.EXTRA AS '額外說明' FROM information_schema.`TABLES` T LEFT JOIN information_schema.`COLUMNS` C ON T.TABLE_NAME = C.TABLE_NAME AND T.TABLE_SCHEMA = C.TABLE_SCHEMA WHERE T.TABLE_SCHEMA = 'erp' ORDER BY C.TABLE_NAME, C.ORDINAL_POSITION;
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