在PostgreSQL中,虽然没有直接的DELETE JOIN语法,但可以通过使用DELETE语句结合USING子句或子查询来实现类似的功能。下面我将详细解释如何在PostgreSQL中使用DELETE JOIN的方式删除数据。 1. 使用 USING 子句 这是PostgreSQL推荐的方式,因为它通常比子查询性能更好。语法如下: sql DELETE FROM table1 USING table2 WHERE ...
DELETE FROM table_name WHERE condition RETURNING id; If you delete data from a table based on data from another table, you can use the DELETE JOIN statement. To delete data that have a foreign key relationship, you use the ON DELETE CASCADE option. Note that the DELETE statement removes da...
Table Expressions To put this together, assume we have tables t1: num | name ---+--- 1 | a 2 | b 3 | c and t2: num | valu... cdongyang 0 456 UPDATE/DELETE 与 JOIN 组合 2007-11-19 16:15 − 常将JOIN用于SELECT语句中,如 SELECT a.ClassID,a.ClassName,b.StudentID,b.Stu...
表具有组合主键时DELETE JOIN的Postgresql等效项对多列使用IN运算符
Fixed datatype of information_schema_tsql.tables.TABLE_TYPE column. Fixed the error - “column ... does not exist” when using table.column with alias defined for table or schema_name.table.column in set clause of update queries. Fixed issue of incorrect schema resolution for multiple function...
Select tables in theData Browserpane to query the database. Close the data source tab to close the SQL query. In theConnectionssection, close the database connection by clickingClose Connection. Note If multiple connections are open, close the database connection of your choice by selecting the...
Update, delete, and foreign keys are currently unsupported on columnar tables. However, you can use partitioned tables in which newer partitions use row-based storage, and older partitions are compressed using columnar storage.To learn more about columnar storage, check out the columnar storage ...
仍然是在 DemoApplication.java 文件中,在 updateData 方法之后添加以下方法,以使用 DELETE SQL 语句删除数据库中的数据: Java 复制 private static void deleteData(Pharmacy todo, Connection connection) throws SQLException { log.info("Delete data"); PreparedStatement deleteStatement = connection.prepareStatement...
-- since we prefer distributed tables, citus_table will be pulled to coordinator-- to support the join. Note that citus_table can be huge.SELECT*FROMcitus_tableJOINpostgres_tableUSING(x);SETcitus.local_table_join_policyto'prefer-local';-- even though there is a constant filter on primary ...
Select tables in theData Browserpane to query the database. Close the data source tab to close the SQL query. In theConnectionssection, close the database connection by clickingClose Connection. Note If multiple connections are open, close the database connection of your choice by selecting the...