删除主键(Vertica数据库的主键值并非唯一的): SELECT ANALYZE_CONSTRAINTS('fb_s.c_log'); 找到key名,再: ALTER TABLE fb_s.c_log DROP CONSTRAINT C_PRIMARY; SELECT ANALYZE_CONSTRAINTS('fb_s.user_info'); ALTER TABLE fb_s.user_info DROP CONSTRAINT C_PRIMARY; 建用户和SCHEMA : CREATE u
MySql 查询表字段数 SELECT COUNT(*) FROM information_schema.columns WHERE table_schema='test_cases' AND table_name='cases_send' ; test_cases 为数据库名称 cases_send 为表名 列出表字段名称 SHOW COLUMNS FROM cases_send
SELECT 表名=d.name,case when a.colorder=1 then d.name 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 ( S
SELECT 表名 = case when a.colorder= then d.name else '' end, 表说明 = case when a.colorder= 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')= then '√'else '' end, 主键 = case when
原文地址:https://blog.csdn.net/changhong009/article/details/29587063 --快速查看表结构(比较全面的) SELECT CASE WHEN col.colorder = 1 THEN obj.name ELSE '' END AS 表名, col.colorder AS 序号 , col.name AS 列名 , ISNULL(ep.[value], '') AS 列说明 , t.name AS 数据类型 , col.length AS
--查询所有表及注释SELECTA.name ,C.valueFROM sys.tables A LEFT JOIN sys.extended_properties C ON C.major_id = A.object_idWHERE C.minor_id=0 group by A.name ,C.value ----查询表字段注释 SELECTA.name AS table_name,B.name AS column_name,C.value AS column_descriptionFROM
1. select a.* from ALL_TAB_COMMENTS a --查表名和表中文名select a.* from ALL_TAB_COLUMNS a --查询表字段属性select a.* from ALL_COL_COMMENTS a --查询表字段名称 2. dba_tables.all_tables和user_tables的区别 dba_tables : 系统里所有的表的信息,需要DBA权限才能查询all_tables : 当前用户有权限的表的信息(只要对某个表有任何权限,