获取用户

-- 获取所有用户信息
select * from all_users;
-- 筛除系统用户
select * from all_users where common = 'NO';

-- 其他需求按条件查找

获取表

-- 获取所有表
select * from all_tables;
-- 获取A用户下的所有表信息
select * from all_tables where owner = 'A';
-- 

注释信息

-- 获取当前用户下所有表及注释
select * from user_tab_comments;
-- 某个表的注释
select * from user_tab_comments where table_name = 'AAAA';
-- 比user_tab_comments 多一个owner列,同时也是查的所有用户，所有表
select * from all_tab_comments;

• 判断表中某字段是否存在

  SELECT COUNT(*)
  FROM all_tab_columns
  WHERE owner IN (
  		SELECT USERNAME
  		FROM all_users
  		WHERE common = 'NO'
  	)
  	AND table_name = 'SJ_JCJLB'
  	AND column_name = 'GZID'
  	
  	-- 注意：在Oracle中字段、表名等全部用大写匹配。
  	-- all_tab_columns 代表全部字段 user_tab_columns 当前用户字段
  	-- 直接用 all_tab_columns查询会特别慢（数据量很大），就把系统用户排除掉
  

• 检测表是否有注释

  SELECT *
  FROM all_tab_comments
  WHERE OWNER IN (
  		SELECT USERNAME
  		FROM ALL_USERS
  		WHERE COMMON = 'NO'
  	)
  	AND COMMENTS IS NULL;
  

• 查找字段注释为空的用户和表信息

  SELECT *
  FROM (
  	SELECT owner, table_name
  	FROM all_col_comments
  	WHERE owner IN (
  			SELECT USERNAME
  			FROM all_users
  			WHERE common = 'NO'
  		)
  		AND COMMENTS IS NULL
  	ORDER BY owner ASC
  )
  GROUP BY owner, table_name;
  

• 查询字段中值是否有中文

  SELECT * FROM  columnName WHERE ASCIISTR(columnName) LIKE '%\%';
  -- columnName 字段名
  

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