DOUBLE非保留保留保留保留 DROP非保留保留保留保留 DYNAMIC保留保留 DYNAMIC_FUNCTION非保留非保留非保留 DYNAMIC_FUNCTION_CODE非保留非保留 EACH非保留保留保留 ELEMENT保留 ELSE保留
let foreign_key = ForeignKey::drop() .name("FK_character_font") .table(Char::Table) .to_owned(); assert_eq!( foreign_key.to_string(MysqlQueryBuilder), r#"ALTER TABLE `character` DROP FOREIGN KEY `FK_character_font`"# ); assert_eq!( foreign_key.to_string(PostgresQueryBuilder), r#...
Drop database is the ultimate truncate, isn't it? :) And "create database from ORM" guarantees 100% consistency between the code and the db schema without even caring about migrations. Third, think about a CI/CD setup with one-click deployment pipeline which run tests as one of the ...
\h [NAME] help on syntax of SQL commands, * for all commands...使用\h命令可以获取 SQL 命令相关的帮助信息:hrdb=> \hAvailable help: ABORT CREATE FOREIGN DATA WRAPPER DROP ROUTINE ALTER AGGREGATE CREATE FOREIGN TABLE DROP RULE ALTER COLLATION CREATE FUNCTION DROP SCHEMA ...
移除列ALTERTABLEproductsDROPCOLUMNdescription; 移除时忽略外键的约束ALTERTABLEproductsDROPCOLUMNdescriptionCASCADE; 增加约束ALTERTABLEproductsADDCHECK(name<>'');ALTERTABLEproductsADDCONSTRAINTsome_nameUNIQUE(product_no);ALTERTABLEproductsADDFOREIGNKEY(product_group_id)REFERENCESproduct_groups;ALTERTABLEproductsALTERCOL...
-c, –clean clean (drop) database objects before recreating在重新创建之前,先清除(删除)数据库对象 -C, –create include commands to create database in dump在转储中包括命令,以便创建数据库(包括建库语句,无需在导入之前先建数据库) -E, –encoding=ENCODING dump the data in encoding ENCODING转储以ENC...
DELETE mytable WHERE column_name = 'column_amount'; Postgres: DELETE FROM mytable WHERE column_name = 'column_amount'; 3. Dropping database objectsIn Postgres, permission to drop objects is restricted to only a database table’s owner or a super user. It is not a gr...
'<your-anon-key>'6 ) 6 Listen to changes by schema Listen to changes on all tables in the public schema by setting the schema property to 'public' and event name to *. The event name can be one of: INSERT UPDATE DELETE * The channel name can be any string except 'realtime'. 1...
to build amulti-tenant applicationon Citus is to distribute all your Postgres tables by a “tenant ID” column. That way rows are (hash-)distributed across nodes, while rows with the same tenant ID value are co-located on the same node for fast local joins, transactions, and foreign keys...
Foreign key constraint Unique constraint Check constraint We will add all these constraints with examples in this guide ahead. Syntax ALTER TABLE NAME_OF_TABLE ADD constaint_type (column_name); This is the basic syntax used to add a constraint containing the column name of a specific table....