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Category Archives: SQL-related Puzzle
esProc Simplifies SQL-style Computations – Dynamically Transposing Rows and Columns
In real-world business, many computing tasks require transposing rows and columns dynamically. There are a lot of discussions around the operation in online IT groups and forums. Below lists some of them: http://www.dbforums.com/showthread.php?1628876-SQL-question-how-to-move-two-column-data-to-one-column-data https://www.linkedin.com/grp/post/137774-5981739289539526658?trk=groups-post-b-title http://stackoverflow.com/questions/29756836/mysql-pivot-table-and-numbered-columns http://www.linkedin.com/groups/need-help-86080.S.5796995228699222017?trk=groups_items_see_more-0-b-ttl SQL implements row-to-column transposition … Continue reading →
How esProc Assists Writing SQL Queries
esProc can simplify complex SQL-style queries using ordered sets, object-style access and stepwise computation. Usually there are two ways in which esProc is used: an independent one and one requiring integration with Java. Now let’s look at the first one … Continue reading →
Comparison between esProc Syntax and SQL Syntax for Common Computations
Structured Query Language, abbreviated as SQL, is usually used to query, store and retrieve data in databases. In esProc, users can return the query result using SQL commands directly, or process data step by step with more flexible and convenient … Continue reading →
Parse and Update Dynamic JSON into Database with esProc
Problem source: http://bbs.csdn.net/topics/390611005 . Below is JSON data (s.json) the system acquires: { “SUCCESS”: [ { “MESSAGE”: “IMEI Service List”, “LIST”: { “MOVISTAR SPAIN”: { “GROUPNAME”: “MOVISTAR SPAIN”, “SERVICES”: { “3”: { “SERVICEID”: 32, “SERVICENAME”: “MOVISTAR NOKIA INSTANTE”, “CREDIT”: 4, “TIME”: “1-30 … Continue reading →
Query List Fields in MongoDB Subdocuments in esProc
Problem source：https://groups.google.com/forum/#!msg/mongodb-user/HqzXSh5DZek/ffZG0TQ1w8cJ . Collection Cbetween contains cascaded subdocuments, in which the List-type dataList field includes a series of strings, each of which has multiple numbers. You need to find strings according to the criterion that the first number is greater than … Continue reading →
Merge MongoDB Documents in esProc
Problem source：https://groups.google.com/forum/#!topic/mongodb-user/BpgEaRqrKsA . Below is a selection of Collection C1： { “_id” : ObjectId(“55014006e4b0333c9531043e”), “acls” : { “append” : { “users” : [ObjectId(“54f5bfb0336a15084785c393”) ], “groups” : [ ] }, “edit” : { “groups” : [ ], “users” : [ ObjectId(“54f5bfb0336a15084785c392”) ] … Continue reading →
esProc Implements Foreign Key Relationship for MongoDB Collections
Problem source：http://stackoverflow.com/questions/29392169/populating-field-values-for-referred-documents-in-aggregate-call-in-mongoose . With MongoDB’s built-in API, you implement a foreign key relationship through hardcoding. The hardcode is not intuitive and difficult to write. In this case you can use esProc to handle this. For example: Collection UserCourseProgres records the … Continue reading →
esProc Exports Unstructured MongoDB Data as CSV Files
Problem source：https://plus.google.com/+VicNgrail/posts/ebS9JUtFopw . MongoDB allows storing unstructured data in it. But it is somewhat difficult to export the data as standard structured data. esProc, however, makes it an easy job, with MongoDB’s cooperation. Let’s look at the steps for doing … Continue reading →
Posted in MongoDB, SQL-related Puzzle
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Tagged code, esProc, export mongodb data, to csv files
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Group MongoDB Collection and Find Top N members in esProc
Problem source：https://groups.google.com/forum/#!topic/mongodb-user/Rjv6lyUCe1s . Collection last3 has two fields: variable and timestamp. You need to first group documents by variable and find from each group the top 3 ones with the latest timestamp, and then find from the three documents the … Continue reading →
Posted in MongoDB, SQL-related Puzzle
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Tagged code example, esProc, group, mongodb, topN
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Join MongoDB Collections with esProc
Problem source: http://stackoverflow.com/questions/29396985/is-there-a-where-like-relation-function-when-using-pymongo . It is difficult to join MongoDB collections through hardcoding as it doesn’t directly support joins. Yet you can use esProc to perform inner join, left join and full join between collections or join the documents. Here … Continue reading →
Posted in MongoDB, SQL-related Puzzle
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Tagged code example, esProc, join, mongodb
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esProc 