可以使用INSERT INTO ... SELECT语句从一个表中选择数据并插入到另一个表中。 INSERTINTOtable_name (column1, column2, column3, ...)SELECTcolumn1, column2, column3, ...FROManother_tableWHEREcondition; SELECT子句用于从another_table中选择要插入的数据。 WHERE子句可选,用于过滤要插入的数据。 示例: ...
Insert from Another TableThis example demonstrates how to insert data from another table: insert_from_table.sql -- CREATE TABLE old_books ( -- book_id INTEGER PRIMARY KEY, -- title VARCHAR(100) NOT NULL, -- author VARCHAR(100) NOT NULL, -- genre VARCHAR(50) NOT NULL, -- price ...
可以使用INSERT INTO ... SELECT语句从一个表中选择数据并插入到另一个表中。 INSERTINTOtable_name(column1,column2,column3,...)SELECTcolumn1,column2,column3,...FROManother_tableWHEREcondition; 1. 2. 3. 4. SELECT子句用于从another_table中选择要插入的数据。 WHERE子句可选,用于过滤要插入的数据。
The INSERT INTO ... SELECT statement allows inserting data into a table by selecting rows from another table or query result. In this case, countries is the destination table where the data will be inserted. SELECT * FROM country_new retrieves all columns and rows from the 'country_new' t...
PostgreSQL是一种开源的关系型数据库管理系统,它支持高度可扩展的数据模型和丰富的功能。当需要向数据库中插入值时,如果该值在数据库中不存在,可以使用以下方法进行插入: 1. 使用INSERT ...
PostgreSQL 目前提供了两种将数据插入数据库的方法,一种是通过 INSERT 语法,一种是通过 COPY 语法。从 SQL 语法的层面可以看出两者有一定的差异,但功能上的重合点是非常多的,因为本质上都是把新的数据行加入到表中。 本文基于 PostgreSQL 17 浅析这两种数据插入方法的内部实现。除语法层面的差异外,两者在 Table Ac...
To insert multiple rows of data in one statement: INSERT INTO table_name (column1, column2, ...) VALUES (value1a, value2a, ...), (value1b, value2b, ...), (value1c, value2c, ...); Insert Using a Subquery You can also insert data from another table using a SELECT query: ...
INSERT INTO ... SELECT Statement Instead of theVALUESclause, you can use aSELECTstatement to fetch records from another table and insert them. Data Copy Example Assuming we have atemp_userstable and we want to copy all its records to theuserstable: ...
You can insert multiple records into a table from another table using theINSERT FROM SELECTstatement, which is a derivative of the basicINSERTstatement. The column ordering and data types must match between the target and the source tables. ...
Delete row This operation deletes a row from a table. Get row This operation gets a row from a table. Get rows This operation gets rows from a table. Get tables This operation gets tables from a database. Insert row This operation inserts a new row into a table. Update row This opera...