✓ 已被采纳 DECLARE variable_col int := (SELECT oid FROM pg_class WHERE relname='tablename'); SELECT * FROM pg_class WHERE oid=variable_col; 手头没 pg 库,没执行,大概意思理解一下。 P.S. variable_col 是变量名,我瞎起的;int 记得改成你那个 oid 的数据类型。 有用1 回复 Ocean: 你...
Caused by: java.sql.SQLException: Table not found in statement [select relname from pg_class] at org.hsqldb.jdbc.Util.sqlException(Unknown Source) at org.hsqldb.jdbc.jdbcStatement.fetchResult(Unknown Source) at org.hsqldb.jdbc.jdbcStatement.executeQuery(Unknown Source) at org.apache...
$idCon1 = mysql_select_db($dbName, $idCon);break;case"pg":if($connectType =="c") { $idCon = pg_connect($connect ." user=". $username ." password=". $password ." dbname=". $dbName); }else{ $idCon = pg_pconnect($connect ." user=". $username ." password=". $password ...
D.select * from processlist; 免费查看参考答案及解析 题目: 47.以下哪些命令可以查看数据库内的角色? A、select*frompg_roles B、select*frompg_user C、\\dg D、\\db 免费查看参考答案及解析 题目: 4.在SELECT查询语句中,以下对UNION子句的约束条件,描述正确的是哪些选项? A、不管是否声明了ALL子句...
通常情况下，我们经常把select 具体字段和select* 进行做比较 举例，如果是select * fromyourtable ， ...
insert into student(id, name,class_id) values(3,'小明',1) on conflict(id) do nothing; ●联合子集更新 # 联合子集更新,把sale_order_line的name连接换行符,然后按id更新到表a_test中对应的name update a_test set name=array_to_string(array(select name from sale_order_line where order_id=a_...
SELECT a,b,c from table where a='xx' and b = 'xx';那么 MySQL 可以直接通过遍历索引取得数据...
带有...,如何快速添加这么一个字段: 首先,在这里我们涉及三张系统表,pg_class(表属性)、pg_attribute(列属性)、pg_attrdef(缺省值信息),接下来依次看一下三张表的信息: #pg_class...:oid表系统序列号,relname表名,relnatts列个数(主要修改属性) postgres=#selectoid,relname,relnatts from pg_class where...
为了获取 tpcds 模式中 customer_address 表的统计信息,使用 select relname , relpages , reltuples from pg_class where relname ='tpcds.customer_address'可以查询到结果 A. 正确 B. 错误 查看完整题目与答案 创建用户jim,登录密码为xxxxxxxx。下 面这两个语句是等价的吗? A. 正确 B. 错误 查看...
All of the projects in openGauss Community are maintained by. That means the developers can comment below every pull request or issue to trigger Bot Commands. Please follow instructions at 步骤如下: 首先根据pg_class获取tableName对应的tableoid...