navicat premium如何将一个字段批量覆盖到另一个字段
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参考技术A 以下是覆盖方法：step1：点击"查询"，step2：点击“新建查询”，step3：命令。
批量替换：将A表CMC里面所有包含a替换成b而不影响其他内容UPDATEASETCMC=REPLACE(CMC，\'a\'，\'b\')。
Navicat Premium快速导出数据库ER图和数据字典
2.快速导出数据库数据字典：
SQL Server 数据库，生成数据字典
use YourDatabase --指定要生成数据字典的数据库 go SELECT 表名=case when a.colorder=1 then d.name else \'\' end, 表说明=case when a.colorder=1 then isnull(f.value,\'\') else \'\' end, 字段序号=a.colorder, 字段名=a.name, 标识=case when COLUMNPROPERTY(a.id,a.name,\'IsIdentity\')=1 then \'√\'else \'\' end, 主键=case when exists(SELECT 1 FROM sysobjects where xtype=\'PK\' and name in ( SELECT name FROM sysindexes WHERE indid in( SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid ))) then \'√\' else \'\' end, 类型=b.name, 占用字节数=a.length, 长度=COLUMNPROPERTY(a.id,a.name,\'PRECISION\'), 小数位数=isnull(COLUMNPROPERTY(a.id,a.name,\'Scale\'),0), 允许空=case when a.isnullable=1 then \'√\'else \'\' end, 默认值=isnull(e.text,\'\'), 字段说明=isnull(g.[value],\'\') FROM syscolumns a left join systypes b on a.xtype=b.xusertype inner join sysobjects d on a.id=d.id and d.xtype=\'U\' and d.name<>\'dtproperties\' left join syscomments e on a.cdefault=e.id left join sys.extended_properties g on a.id=g.major_id and a.colid=g.minor_id left join sys.extended_properties f on d.id=f.major_id and f.minor_id =0 --where d.name=\'要查询的表\' --如果只查询指定表,加上此条件 order by a.id,a.colorder
或者将表头赋值放在后面：
-- 数据字典 SELECT (CASE WHEN a.colorder = 1 THEN d.name ELSE \'\' END) 表名 ,a.colorder 字段序号 ,a.name 字段名 ,(CASE WHEN COLUMNPROPERTY(a.id, a.name, \'IsIdentity\') = 1 THEN \'√\' ELSE \'\' END) 标识 ,(CASE WHEN (SELECT COUNT(*) FROM sysobjects WHERE (name IN (SELECT name FROM sysindexes WHERE (id = a.id) AND (indid IN (SELECT indid FROM sysindexkeys WHERE (id = a.id) AND (colid IN (SELECT colid FROM syscolumns WHERE (id = a.id) AND (name = a.name)) )) )) ) AND (xtype = \'PK\')) > 0 THEN \'√\' ELSE \'\' END) 主键 ,b.name 类型 ,a.length 占用字节数 ,COLUMNPROPERTY(a.id, a.name, \'PRECISION\') AS 长度 ,ISNULL(COLUMNPROPERTY(a.id, a.name, \'Scale\'), 0) AS 小数位数 ,(CASE WHEN a.isnullable = 1 THEN \'√\' ELSE \'\' END) 允许空 ,ISNULL(e.text, \'\') 默认值 ,ISNULL(g.[value], \'\') AS 字段说明 FROM syscolumns a LEFT JOIN systypes b ON a.xtype = b.xusertype INNER JOIN sysobjects d ON a.id = d.id AND d.xtype = \'U\' AND d.name <> \'dtproperties\' LEFT JOIN syscomments e ON a.cdefault = e.id LEFT JOIN sys.extended_properties g ON a.id = g.major_id AND a.colid = g.major_id ORDER BY a.id, a.colorder
接下来将数据字典导出：
首先，点击右上角的导出
然后，选择导出格式：
选择导出的地址和输入文件的名称
参考：https://www.idaima.com/article/3083
MySQL，生成数据字典
USE information_schema; SELECT T.TABLE_SCHEMA AS \'数据库名称\', T.TABLE_NAME AS \'表名\', T.TABLE_TYPE AS \'表类型\', T. ENGINE AS \'数据库引擎\', C.ORDINAL_POSITION AS \'字段编号\', C.COLUMN_NAME AS \'字段名\', C.COLUMN_TYPE AS \'数据类型\', C.IS_NULLABLE AS \'允许为空\', C.COLUMN_KEY AS \'键类型\', C.EXTRA AS \'自增属性\', C.CHARACTER_SET_NAME AS \'编码名称\', C.COLUMN_COMMENT AS \'字段说明\' FROM COLUMNS C INNER JOIN TABLES T ON C.TABLE_SCHEMA = T.TABLE_SCHEMA AND C.TABLE_NAME = T.TABLE_NAME WHERE T.TABLE_SCHEMA = \'mysql\' --指定要生成数据字典的数据库
参考：http://www.jianshu.com/p/f491d0d3c503
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