mongodb查询语句怎么合并查询结果？

想用一条语句查询三条记录，包括当前记录、上一条、下一条，怎么实现？只知道当前记录的_id，需要按另外一个时间字段排序取相临的记录。

迷茫 2017-05-02 09:22:41 0  1  617

Why can't I query the data after adding the where statement?

Why can’t I query the data after adding the where statement?

HZz 2018-03-31 14:57:59 0  5  1642

Embedding query operations in MySQL IF statements

Is there a way to run insert query in IF statement, I know the syntax of if statement is IF (condition, statement to be executed if condition is true, statement to be executed if condition is false) My question is if it is possible to run insert statement based on condition, For example IF((select c...

P粉155832941 2024-02-17 16:44:15 0  1  492

Write the query statement according to the teacher's tutorial. The result was an error!

Dump(Db::query( sqsl:'select * from 'user' limit 1 ')); The query statement written according to the teacher's tutorial. The result was an error! syntax error, unexpected ':', expecting ')'

两大一小三俘虏 2019-11-14 19:19:30 0  0  1116

Print sql statement

How to print sql statements except queries

张默 2019-08-05 11:22:17 0  0  1110

spring - Regarding the problems encountered in keyword query: the problem of writing sql statements into java

I am a database novice. My senior assigned me a keyword query task. I encountered some problems when writing the database query statement. Select * from COMPLIANCE_CONSULT where CONSULT_TITLE like '%keyword%'or CONSULT_CONTENT like '%keyword%'or REPLY_C.. .

为情所困 2017-05-27 17:41:38 0  2  886

shell - mysql跨年查询

想问问mysql如何查询当季新品销售额的查询的语句，，因为季节会涉及到跨年，，所以很难根据销售日去确定它是不是当季新品的销售。。

世界只因有你 2017-04-25 09:02:47 0  1  805

MongoDB3.2.10 geo query is too slow problem

Version Mongo3.2.10 Problem: Geo query under dense cluster returns the most recent 30 records, and 20,000+ records need to be scanned. For the same point set, try to build 2d index and 2dsphere index query, and the execution efficiency is not much different. Execution statement Execution environment...

阿神 2017-05-24 11:31:32 0  2  938

Pagination, can the data array queried using SQL statements be paginated? $list=query($sql); It seems that the paginate() method cannot be used

Can the data array queried using SQL statements be paginated? $list=query($sql); It seems that the paginate() method cannot be used

带砖侍卫 2018-03-26 23:56:10 0  5  1631

SQL statement, how can we query the first word of this field in the data table through a Chinese character?

SQL statement, how can we query the first word of this field in the data table through a Chinese character?

rain 2020-02-16 10:45:14 0  1  1135

How does Thinkphp query the database in batches?

1. I have such a requirement: there are 4 kinds of inventory in the warehouse receipt. I want to query whether there is such inventory in the existing table. If there is, increase the quantity. If not, create new data. The where condition is an array. How should I query? 2. where condition {code...}...

天蓬老师 2017-05-27 17:42:03 0  4  669

Using media query conditional statements in Tailwind CSS

How to express this ${window.scrollY>0?"bg-slate-50":""}Conditional statement checking only for Tailwind with medium or large screen sizes?

P粉835428659 2023-08-10 15:17:27 0  2  559

Mysql Begin End statement error

The poster wanted to write a complex statement, but it always reported a "begin end" error, so he simplified it to just one sentence, but it was still wrong. After querying the statement, I really don't know where the problem is. The poster's code has this error: I don't know the problem. ...

typecho 2017-06-30 09:54:32 0  1  1299

TP6 How to use exec to execute statements in batches

Currently using the framework TP6, I need to execute statements in batches except for queries, but TP6's execute seems not to be able to execute statements in batches (such as: execute("Update statement first; Update statement second;") This will report an error), I think I need PDO's exec...

lis 2020-12-16 17:06:22 0  1  1122

mysql - mybatis query counts the number of a certain column, group query based on a column, how to receive in xml file

Mybatis query counts the number of a certain column. According to a column, group query. I don’t know how to write the resultType parameter in the xml file. SQL statement: select title_type,COUNT(title) from qa_title where title like '%车%' GROUP BY title_type; xml: <...

ringa_lee 2017-06-15 09:21:18 0  1  1375

Query problem identifying uppercase and lowercase letters

Query statements that use binary to identify uppercase and lowercase letters in traditional SQL development can recognize uppercase and lowercase letters: select uid from wjoy_log where binary uid='$uid' order by id desc. The sentence that cannot recognize uppercase and lowercase letters: $res = Wjo...

豆豆小师弟 2020-10-25 11:54:34 0  3  1009

MySQL error using DISTINCT query and ORDER BY

I'm trying to perform a DISTICNT query on one column and sort by another column that is not in a SELECT statement. I get this error: Query failed SQLSTATE[HY000]: General error: 3065 Expression #1 ORDERBY clause is not in the SELECT list, referenced column 'midnites_midNite.product_in_category.sortO...

P粉541551230 2024-03-31 10:27:16 0  1  533

PHP query data has no results

Weird problem. The code that worked before suddenly failed to produce results today. I used SQL statements to check the database and could find it. I don’t know where the problem lies. The PHP version number is 5.2.0. The code is as follows: {code...}

曾经蜡笔没有小新 2017-05-24 11:31:07 0  2  630

SYMFONY2 LEFTJOIN query error

There are two instances of blog and comment: blog.comments stores the comment type comment.blog_id is the foreign key of blog. My query statement: {code...} Error message: {code...} The main code of comment, others are Is the generated {code...} blog main code...

習慣沉默 2017-05-16 16:44:35 0  1  569

Optimize the use of CASE statements in MySQL

Hi everyone, I have a form as shown in the screenshot above. I wrote a query using a CASE statement so that it will return the extra columns I need. Here is the query I wrote: SELECT*,CASEWHEN(SUM(CASEWHENclass='class1'THEN1END)OVER(PARTITIONBYstudent_id))>=1THEN1ELSE0ENDAS'Class1',CASEWHEN(SUM(C...

P粉463840170 2023-09-04 18:42:48 0  2  583