Question

我正在尝试使用以下命令创建表：

SELECT
    data_req,
    count(servico) as qtdeServico,
    count(metodo) as qtdeMetodo,
    consumerid,
    metodo,
    status_metodo,
    servico,
    sum(tempo_req)
INTO
    consolidado
FROM 
    requisicoes AS r
WHERE 
    r.data_req > SELECT MAX(c.data_req) FROM consolidado c  
GROUP BY 
    data_req, consumerid, metodo, status_metodo, servico;

不幸的是，我在where的select子句中遇到错误。我正在使用postgres。

有什么建议吗？预先感谢。

Answer 1

您的查询具有许多特质。以下是更正确的语法：

create table consolidado as 
    select data_req, count(servico) as qtdeServico, count(metodo) as qtdeMetodo,
           consumerid, metodo, status_metodo, servico,
           sum(tempo_req) as sum_tempo_req
    from requisicoes r
    where r.data_req > (select max(c.data_req) from consolidado c) 
    group by data_req, consumerid, metodo, status_metodo, servico;

这可以修复以下错误：

Postgres建议使用CREATE TABLE AS胜过SELECT INTO（请参阅here）。
创建表时应命名所有列。
您需要在子查询周围添加括号。

但是，查询没有意义。它正在创建一个名为consolidado的表并从该表中读取。从逻辑上讲这很麻烦。另外，qtMetodo和qtdeServico通常具有相同的值-它们位于GROUP BY列中，这意味着它们被组分隔。

Answer 2

请尝试在SELECT句子周围加上“（.....）”：

SELECT
    data_req,
    count(servico) as qtdeServico,
    count(metodo) as qtdeMetodo,
    consumerid,
    metodo,
    status_metodo,
    servico,
    sum(tempo_req)
    into consolidado
    FROM requisicoes as r
    WHERE 
    r.data_req > (select max(c.data_req) from consolidado c  
    GROUP BY data_req, consumerid, metodo, status_metodo, servico);

Answer 3

假设consolidado已经存在。.您将需要使用INSERT INTO ()... SELECT语法。子查询也应放在括号内：

INSERT INTO consolidado (data_req, qtdeServico.. rest of cols)
SELECT
    data_req,
    count(servico) as qtdeServico,
    count(metodo) as qtdeMetodo,
    consumerid,
    metodo,
    status_metodo,
    servico,
    sum(tempo_req)
FROM requisicoes as r
WHERE r.data_req > (select max(c.data_req) from consolidado c)
GROUP BY data_req, consumerid, metodo, status_metodo, servico;

Answer 4

除了其他人关于CREATE TABLE AS vs SELECT INTO的观点外，我会高度推荐他们结帐CREATE MATERIALIZED VIEW，听起来像是您想要的更多东西。

WHERE子句postgres中的SELECT问题

4 个答案: