select * from pg_extension; 4、查询数据库中的所有表及其描述 select relname as TABLE_NAME ,col_description(c.oid, 0) as COMMENTS from pg_class c where relkind = 'r' and relname not like 'pg_%' and relname not like 'sql_%' 四、获取数据大小 1、查询执行数据库大小 select pg_size_pre...
locktime FROM pg_user a,pg_user_status b WHERE a.usesysid=b.roloid; Example of the FULL JOIN clause Fully join the data in the pg_user and pg_user_status tables. SELECT a.usename,b.locktime,a.usesuper FROM pg_user a FULL JOIN pg_user_status b on a.usesysid=b.roloid; ...
* Connect to server */functionsql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false){if(!function_exists('mssql_connect')) {$this->connect_error ='mssql_connect function does not exist, is mssql extension installed?';return...
首先,确保你有超级用户权限,然后执行以下命令安装pgrowlocks: CREATE EXTENSION IF NOT EXISTS pgrowlocks; 3.2 启用 安装完成后,pgrowlocks即可立即使用,无需额外配置。 3.3 使用方法 pgrowlocks提供了两个主要的函数:pgrowlocks和pgrowlocks_approx。前者提供精确的行级锁信息,后者则提供近似的行级锁信息,适用于...
CALL hg_create_table_like('new_table', 'select *, 1 as c, ''a'' as c from src_table'); ERROR: column "c" specified more than once CONTEXT: SQL statement "create table new_table ( "a" integer, "b" text, "c" integer, "c" text );" PL/pgSQL function hg_create_table_like...
RY 实时数仓简介:技术特点 DELETE:注意事项 DELETE:示例 CREATE TABLE:注意事项 UPDATE:语法格式 SELECT:语法格式 查询高性能:全并行的数据查询处理 PG_COMM_STATUS PG_AVAILABLE_EXTENSION_VERSIONS 来自:云商店 查看更多 → ECS自建数据库的数据迁移到华为云数据库GaussDB for MySQL_数据实时同步 全量迁移 全量...
在各个主流...PHP 扩展其中 pdo_pgsql 表示 PostgresSQL 数据库驱动,pdo_sqlite 表示 SQLite 数据库驱动。...= new PDO($dsn, $user, $pass); // 执行 SQL 查询 $sql = $pdo->quote('SELECT * FROM `post` ORDER BY...接下来,我们就可以调用 PDO 对象实例 $pdo 上的 query 方法执行指定 SQL ...
Currently, the maximum size of the input XMLTYPE (in ORA compatibility mode) or XML (in PG compatibility mode) type data is 1 GB. For upgrade from a version that does not support XMLTABLE to a version that supports XMLTABLE, the XMLTABLE syntax cannot be used during the upgrade observati...
( select id from (select * from users) u where id < 10 limit 10 ) u1...select cast('1' as signed); Rails 里 string 类型,PG 映射成 varchar,MySQL 映射成 varchar(255),而 PG 的 varchar 其实是可以存储超过...同时,TiDB 5.0 之后,很多新的特性也将陆续发布,比如表达式索引、CTE、临时表等...
Similarly workspg_stat_statementsview, frompg_stat_statementsextension. Additionally, you get access to two more views that aren'tpg_stat_*:pg_backend_memory_contextsandpg_shmem_allocations. pg_read_server_files (Pg 11+) This is somewhat similar topg_execute_server_program, but instead of all...