1. CREATE OR REPLACE VIEW 按照"CREATE OR REPLACE VIEW" 关键字搜索,这部分代码在ATExecCmd函数(tablecmds.c文件)。可以看到它对应的命令类型叫AT_AddColumnToView,对应操作为调用ATExecAddColumn函数为视图新加列。 /* * ATExecCmd: dispatch a subcommand to appropriate execution routine */ static void AT...
Write a PostgreSQL query to create a view that joins the Employees and Departments tables.Solution:-- Create a view to display employee names along with their department names. CREATE VIEW EmployeeDepartment AS SELECT e.employee_id, e.name, d.department_name FROM Employees e ...
(https://www.postgresql.org/docs/10/static/sql-createview.html) Postgres limitates the replace view function to only add new columns. CockroachDB could support this sqlstatement too, as it's very convenient way to replace views. A Workaround would be dropping and creating a view in a trans...
In these articles, we will learn about PostgreSQL Views. Views are basically a query with a name; therefore, a view is useful for wrapping a commonly used complex query; we can represent data in the database tables using views named query, we can define views using one or more tables kno...
PostgreSQL INSERT INTO 语句用于向表中插入新记录。 我们可以插入一行也可以同时插入多行。 INSERTINTOTABLE_NAME (column1, column2, column3,...columnN)VALUES(value1, value2, value3,...valueN); column1, column2,...columnN 为表中字段名。
replaceIfExists If true, Liquibase uses CREATE OR REPLACE syntax when creating the view. Default: false. Available in Liquibase 1.5+. databricks, db2, firebird, h2, hsqldb, ingres, mariadb, mssql, mysql, oracle, postgresql, sqlite, sybase schemaName Name of the schema all selectQuery SQ...
PostgreSQL 之 CREATE FUNCTION 官方文档 语法: CREATE [ OR REPLACE ] FUNCTION name ( [ [ argmode ] [ argname ] argtype [ { DEFAULT | = } default_expr ] [, ...] ] ) [ RETURNS rettype | RETURNS TABLE ( column_name column_type [, ...] ) ] { LANGUAGE lang_name | ...
If you perform the role of both the database administrator and geodatabase administrator and, therefore, know the password for both login roles, you can use the Create Enterprise Geodatabase geoprocessing tool or a Python script that calls the tool to create a geodatabase in P...
CREATE OR REPLACE PROCEDURE将会创建一个新过程或者替换一个已有的定义。为了能够定义过程,用户必须具有所使用的语言上的USAGE特权。 如果这个命令中包括了一个方案名称,则该过程将被创建在该方案中。否则过程将被创建在当前的方案中。新过程的名称不能匹配同一方案中具有相同输入参数类型的任何现有过程或函数。不过,...
CREATE FUNCTION定义一个新函数。CREATE OR REPLACE FUNCTION将创建一个新函数或者替换一个现有的函数。要定义一个函数,用户必须具有该语言上的USAGE特权。 如果包括了一个模式名,那么该函数会被创建在指定的模式中。否则,它会被创建在当前模式中。新函数的名称不能匹配同一个模式中具有相同输入参数类型的任何现有函数...