Question

嗨我有这样的东西作为更复杂查询的一部分：

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

我不想执行stmt本身，而是想从执行结果中创建一个表。

Create table A as select * from (Execute stmt)

给我错误

编辑：这是整个过程：

    Use catdatabase;
SET SESSION group_concat_max_len = 1000000;
SET @sql = NULL;
SELECT
    GROUP_CONCAT(DISTINCT
    CONCAT('SUM(CASE WHEN columnA = "'  ,columnA, '"THEN 1 ELSE 0 end) AS "'  ,columnA, '"'))
INTO @sql
FROM
  tableB;

SET @sql = CONCAT('SELECT columnB, Count(*) total, ', @sql, ' 
                  FROM tableA inner join tableB on tableA.columnC = tableB.columnE where tableA.columnD <> "catpoop"
                   GROUP BY columnB');

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

Answer 1

set @table='t2';
SET @table1 = 'test';
set @a = concat('create table ',@table,' select * from ',@table1);
prepare stmt1 from @a;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;

https://dev.mysql.com/doc/refman/5.0/en/sql-syntax-prepared-statements.html

更新

SET SESSION group_concat_max_len = 1000000;
SET @sql = NULL;
SELECT
    GROUP_CONCAT(DISTINCT
    CONCAT('SUM(CASE WHEN columnA = "'  ,columnA, '"THEN 1 ELSE 0 end) AS "'  ,columnA, '"'))
INTO @sql
FROM
  tableB;

SET @sql = CONCAT('SELECT columnB, Count(*) total, ', @sql, ' 
                  FROM tableA inner join tableB on tableA.columnC = tableB.columnE where tableA.columnD <> "catpoop"
                   GROUP BY columnB');
set @new_sql = concat ('create table A',@sql);
PREPARE stmt FROM @new_sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

Answer 2

正如我所见，您想要转移数据并希望保存到临时表中。我已更新您的查询，请查看此内容：

Use catdatabase;
SET SESSION group_concat_max_len = 1000000;
SET @sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT('SUM(CASE WHEN columnA = "'  ,columnA, '"THEN 1 ELSE 0 end) AS "'  ,columnA, '"'))
INTO @sql
FROM
tableB;

SET @sql = CONCAT('Create temporary table temp SELECT columnB, Count(*) total, ', @sql, ' FROM tableA inner join tableB on tableA.columnC = tableB.columnE where tableA.columnD <> "catpoop"
               GROUP BY columnB');

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

如果您收到任何错误，请告诉我。

从先前准备好的statemt创建表

2 个答案: