CREATE TEMP TABLE temp_employees AS SELECT * FROM employees WHERE department = 'Sales'; 这条语句与上面的 SELECT INTO 语句功能相同,但使用了 CREATE TABLE AS 语法。 总结 在PostgreSQL 中,可以使用 SELECT INTO 语句结合 TEMPORARY 关键字来创建临时表,并根据查询结果填充数据。但出于兼容性和功能性的考虑...
TEMPORARYorTEMP如果被指定,该表被创建为一个临时表。详见 CREATE TABLE。 UNLOGGED如果被指定,该表会被创建为一个LOGGED表。 new_table要创建的表的名字(可以是模式限定的)。 说明 所有其他参数在SELECT中有详细描述。 说明 CREATE TABLE AS在功能上与SELECT INTO相似。CREATE TABLE AS是被推荐的语法,因为这种形式...
Unlike a regular SELECT statement, the SELECT INTO statement does not return a result to the client. Here’s the basic syntax of the PostgreSQL SELECT INTO statement: SELECT select_list I INTO [ TEMPORARY | TEMP ] [ TABLE ] new_table_name FROM table_name WHERE search_condition; To create...
SELECT*INTOTEMPTABLEemp_temp_tableFROMemp_info; Execute the below command to confirm the table’s duplication: SELECT*FROMemp_temp_table; The output states that ten records have been selected from the “emp_info” table and inserted into the “emp_temp_table”. Conclusion In PostgreSQL, theSEL...
Select Id,Name as Name INTO #T3 from TestInto1Union AllSelect NULL,NULLDelete From #T3 Where Id is NULLInsert Into #T3(Id) Values(3)Select * from #T3Go--Converting NULLABLE column into NOT NULLABLE columnCreate Table TestInto2(Id int not null,...
IF temp is null or temp='' THEN prefix:=''; ELSE prefix:=v_prefix||'.'; END IF; select 'select '||t.col||' from '||UPPER(v_table)||' '||v_prefix into Rtsql from (select wm_concat(t1.col) as col from (select prefix||column_name as col from user_tab_columns where Ta...
(EOF "")) SELECT INTO tableam_tblselectinto_heapx FROM tableam_tbl_heapx;.742: (root (stmtblock (stmtmulti (stmt (selectstmt (select_no_parens (select_clause (simple_select_intersect (simple_select_pramary (SELECT "SELECT") (into_clause (INTO "INTO") (opttempTableName (qualified_...
This query works for PostgreSQL, MySQL, and SQL Server databases: SELECT * FROM ( SELECT id, name, textbook, credits FROM Course WHERE is_active = 'No' ) AS Temp_table; Here is the result of that query: As we can see, the output is saved asTemp_table. ...
CREATE TABLE #temp (column1 datatype, column2 datatype); INSERT INTO #temp SELECT column1, column2 FROM table1 WHERE condition; SELECT column1, column2 FROM #temp; 这样可以将子查询的结果存储在临时表中,并在主查询中使用该临时表来获取多个列的结果。 以上是几种常见的方法,根据具体情况选择合适...
如下图，使用x == np.max(x) 获得一个掩模矩阵，然后使用where方法即可返回最大值对应的行和列。