Oracle查询库中所有表信息

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Oracle 查询库中所有表信息

查询所有表名:

select t.table_name from user_tables t;

查询所有字段名:

select t.column_name from user_col_comments t;

查询指定表的所有字段名:

select t.column_name from user_col_comments t where t.table_name = "BIZ_DICT_XB";

查询指定表的所有字段名和字段说明:

select t.column_name, t.column_name from user_col_comments t where t.table_name = "BIZ_DICT_XB";

查询所有表的表名和表说明:

select t.table_name,f.comments from user_tables t

inner join user_tab_comments f on t.table_name = f.table_name;

查询模糊表名的表名和表说明:

select t.table_name from user_tables t where t.table_name like "BIZ_DICT%";

select t.table_name,f.comments from user_tables t

inner join user_tab_comments f on t.table_name = f.table_name

where t.table_name like "BIZ_DICT%";

--查询表的数据条数、表名、中文表名

select a.num_rows, a.TABLE_NAME, b.COMMENTS

from user_tables a, user_tab_comments b

WHERE a.TABLE_NAME = b.TABLE_NAME

order by TABLE_NAME;

原文链接 https://www.cnblogs.com/momoyan/p/9129169.html

Oracle日期时间范围查询

--字段为:字符串类型(char),长度为:10  

SELECT * FROM testdatetime t WHERE 1=1 AND t.createdate = "2011-07-01";

SELECT * FROM testdatetime t WHERE 1=1 AND to_date(t.createdate,"yyyy-MM-dd") between to_date("2011-06-01","yyyy-MM-dd") and to_date("20110705","yyyymmdd") ;

--字段为:字符串类型(char),长度为:20

SELECT * FROM testdatetime t WHERE 1=1 AND t.usedate = "2011-07-01 10:00:00";

SELECT * FROM testdatetime t WHERE 1=1 AND to_date(t.usedate,"yyyy-MM-dd HH24:MI:SS")

between to_date("2011-07-01 12:00:00","yyyy-MM-dd HH24:MI:SS") and to_date("20110702 12:00:00","yyyymmdd HH24:MI:SS") ;

--字段为:日期时间类型(date)

SELECT * FROM testdatetime t WHERE 1=1 AND t.startdate = to_date("2011-07-01","yyyy-MM-dd");

--字段为:字符串类

SELECT * FROM testdatetime t WHERE 1=1 AND to_char(t.startdate,"yyyy-MM-dd") = "2011-07-01";

原文连接 https://www.cnblogs.com/james641/p/5805526.html

--获取现在时间

SELECT sysdate FROM dual;

以上是 Oracle查询库中所有表信息 的全部内容, 来源链接: utcz.com/z/534457.html

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