【2】数据库环境准备 SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- --- -- Table structure for tb_user 没有给自增 -- --- DROP TABLE IF EXISTS `tb_user`; CREATE TABLE `tb_user` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_name` varchar(255) DEFAULT NULL, `passwor...
5mins of Postgres E27: Postgres 16 - Make subquery alias optional in FROM clause21 July, 2022 Today, we are talking about a change in Postgres 16, that removes the alias requirement for subqueries in FROM. This may seem like a very obscure problem, but it's actually a very common issue...
Pick the right distribution key Identify types of tables Adjust primary/foreign keys to include distribution key Add distribution key filters and joins to the queries as much as possible Be aware of the few cross-shardSQL limitationswhich we are working very hard to remove on eachrelease If you...
NodeTag type; RangeVar *relation;/* relation to update */List *targetList;/* the target list (of ResTarget) */// 对应语句中的set id = 0;信息在这里Node *whereClause;/* qualifications */List *fromClause;/* optional from clause for more tables */List *returningList;/* list of express...
it offers the ability to inherit security properties and accounts from the underlying operating system, limiting access to datasets and administrative resources. It allows for creation of administrative accounts directly within the database itself. It offers connections over TCP/IP, with optional encrypti...
sslmode=true', in_vpc: false, // optional: if false, will use provided SSH tunnel when deployed tunnel: { // optional: use this if we need to SSH tunnel into database host: 'my.ssh.host.com', port: 22, user: 'ec2-user', private_key: 'path/to/private_key.pem' } }; await...
subscription_name - optional name of the existing subscription, when no name was provided, the function will show status for all subscriptions on local node pglogical.show_subscription_table(subscription_name name, relation regclass) Shows synchronization status of a table. Parameters: subscription_name...
. While distributing your Postgres tables you need to decide on some properties such asdistribution column. And even before you decide on your distribution column (sometimes called a distribution key, or a sharding key), when you create a Postgres tab...
The teardown SQL block is executed once after the test is finished. Use this to clean up in preparation for the next permutation, such as dropping any test tables created by setup. This part is optional. session "<name>" There are normally several "session" parts in a spec file. Each ...
!!! Note Specifying a field type is optional for descriptive purposes and has no effect on whether EDB*Loader successfully inserts the data in the field into the table column. Successful loading depends on the compatibility of the column data type and the field value. For example, a column ...