小编典典

在SQL中使用IN与元组集(SQLite3)

sql

我在SQLite3数据库中具有下表:

CREATE TABLE overlap_results (
neighbors_of_annotation varchar(20),
other_annotation varchar(20),
set1_size INTEGER,
set2_size INTEGER,
jaccard REAL,
p_value REAL,
bh_corrected_p_value REAL,
PRIMARY KEY (neighbors_of_annotation, other_annotation)
);

我想执行以下查询:

SELECT * FROM overlap_results WHERE 
(neighbors_of_annotation, other_annotation)
IN (('16070', '8150'), ('16070', '44697'));

也就是说,我有几个批注ID的元组,我想获取每个这些元组的记录。sqlite3提示给我以下错误:

SQL error: near ",": syntax error

如何正确将其表示为SQL语句?


编辑 我意识到我并没有很好地解释我真正的追求。让我再尝试一下。

如果一个人给我neighbors_of_annotation他们感兴趣的任意术语列表,我可以编写如下的SQL语句:

SELECT * FROM overlap_results WHERE 
neighbors_of_annotation
IN (TERM_1, TERM_2, ..., TERM_N);

但现在假设这个人想给我双方面的,如果形式(TERM_1,1, TERM_1,2)(TERM_2,1, TERM_2,2),…
(TERM_N,1, TERM_N,2),这里TERM_i,1neighbors_of_annotationTERM_i,2other_annotation。SQL语言是否提供同样优雅的方法来为感兴趣的对(元组)制定查询?

最简单的解决方案似乎是为这些对创建一个新表,然后将该表与要查询的表连接起来,并仅选择第一项和第二项匹配的行。创建大量AND / OR语句看起来很可怕,而且容易出错。


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2021-04-19

共1个答案

小编典典

我从未见过这样的SQL。如果存在,我会怀疑它是非标准扩展。尝试:

SELECT * FROM overlap_results
WHERE neighbors_of_annotation = '16070'
AND   other_annotation = '8150'
UNION ALL SELECT * FROM overlap_results
WHERE neighbors_of_annotation = '16070'
AND   other_annotation = '44697';

换句话说,从元组构建动态查询,但以一系列的并集或在OR中的一系列AND的形式构建动态查询:

SELECT * FROM overlap_results
WHERE (neighbors_of_annotation = '16070' AND other_annotation =  '8150')
OR    (neighbors_of_annotation = '16070' AND other_annotation = '44697');

因此,代替代码(伪代码,仅在我的脑海中进行测试,因此调试是您的责任),例如:

query  = "SELECT * FROM overlap_results"
query += " WHERE (neighbors_of_annotation, other_annotation) IN ("
sep = ""
for element in list:
    query += sep + "('" + element.noa + "','" + element.oa + "')"
    sep = ","
query += ");"

相反,您会得到类似以下内容的信息:

query  = "SELECT * FROM overlap_results "
sep = "WHERE "
for element in list:
    query += sep + "(neighbors_of_annotation = '" + element.noa + "'"
    query += " AND other_annotation = '" + element.oa + "')"
    sep = "OR "
query += ";"
2021-04-19