join

问题 Hi I want to get data from database, I am using join query but I have got this error: QueryException in Connection.php line 673: SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'surat_masuk' (SQL: select jenis_surat . jenis_surat , surat_masuk . nomor_surat , surat_masuk . perihal , surat_masuk . tanggal_publish from surat_masuk inner join jenis_surat on id_jenis_surat = jenis_surat . id_jenis_surat inner join surat_masuk on id_jenis_surat = surat_masuk . id

问题 Hi I want to get data from database, I am using join query but I have got this error: QueryException in Connection.php line 673: SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'surat_masuk' (SQL: select jenis_surat . jenis_surat , surat_masuk . nomor_surat , surat_masuk . perihal , surat_masuk . tanggal_publish from surat_masuk inner join jenis_surat on id_jenis_surat = jenis_surat . id_jenis_surat inner join surat_masuk on id_jenis_surat = surat_masuk . id

问题 Hi I want to get data from database, I am using join query but I have got this error: QueryException in Connection.php line 673: SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'surat_masuk' (SQL: select jenis_surat . jenis_surat , surat_masuk . nomor_surat , surat_masuk . perihal , surat_masuk . tanggal_publish from surat_masuk inner join jenis_surat on id_jenis_surat = jenis_surat . id_jenis_surat inner join surat_masuk on id_jenis_surat = surat_masuk . id

问题 I found that the Hive does not support non-equi join.Is it just because it is difficult to convert non-equi join to Map reduce? 回答1: Yes, the problem is in current map-reduce implementation. How common equi-join is implemented in MapReduce? Input records are being copied in chunks to the mappers, mappers produce output as key-value pairs, which are collected and distributed between reducers using some function in such way that each reducer will process the whole key, in other words, mapper

问题 I found that the Hive does not support non-equi join.Is it just because it is difficult to convert non-equi join to Map reduce? 回答1: Yes, the problem is in current map-reduce implementation. How common equi-join is implemented in MapReduce? Input records are being copied in chunks to the mappers, mappers produce output as key-value pairs, which are collected and distributed between reducers using some function in such way that each reducer will process the whole key, in other words, mapper

问题 Dog entity @Entity(tableName = "dog_table") public class DogEntity { private int mId; private String mName, mBreed; etc.. } Toy entity @Entity(tableName = "toy_table") public class ToyEntity { private int mId; private String mName, mBrand; etc.. } DogAndToy join table entity @Entity(tableName = "dog_and_toy_join_table", primaryKeys = {"mDogID", "mToyId"}, foreignKeys = { @ForeignKey( entity = DogEntity.class, parentColumns = "mId", childColumns = "mDogID", onDelete = ForeignKey.CASCADE,

问题 I've seen similar questions posted here but either I don't get the answers or they don't apply... here is what I need and thought it would be really simple: I have a set of items and each item has a set of subitems. The number of subitems changes per item. E.G.: Item 1 SubItem 1-1 SubItem 1-2 SubItem 1-3 Item 2 SubItem 2-1 Item 3 SubItem 3-1 SubItem 3-2 For a very specific use, the want is to add a comment for every possible combination of subitems on each item, plus a boolean property on

问题 how can I use parent/child relationship in ElasticSearch-7 all my documents have _doc type I want to implement something like the one shown below // index = `order_item` { "ID": 1, "Name": "Shoes", "Price": 9.99, "OrderID": 82 }, { "ID": 2, "Name": "Hat", "Price": 19.99, "OrderID": 82 } // index = `order` { "ID": 82, "Customer": "John Smith" } I want join these indices as below with parent/child relationship order { "ID": 82, "Customer": "John Smith", "order-item": [ { "ID": 1, "Name": "Shoes

问题 how can I use parent/child relationship in ElasticSearch-7 all my documents have _doc type I want to implement something like the one shown below // index = `order_item` { "ID": 1, "Name": "Shoes", "Price": 9.99, "OrderID": 82 }, { "ID": 2, "Name": "Hat", "Price": 19.99, "OrderID": 82 } // index = `order` { "ID": 82, "Customer": "John Smith" } I want join these indices as below with parent/child relationship order { "ID": 82, "Customer": "John Smith", "order-item": [ { "ID": 1, "Name": "Shoes

问题 how can I use parent/child relationship in ElasticSearch-7 all my documents have _doc type I want to implement something like the one shown below // index = `order_item` { "ID": 1, "Name": "Shoes", "Price": 9.99, "OrderID": 82 }, { "ID": 2, "Name": "Hat", "Price": 19.99, "OrderID": 82 } // index = `order` { "ID": 82, "Customer": "John Smith" } I want join these indices as below with parent/child relationship order { "ID": 82, "Customer": "John Smith", "order-item": [ { "ID": 1, "Name": "Shoes