left-join

问题 I've got one master table, which has items stored in multiple levels, parents and childs, and there is a second table which may or may not have additional data. I need to query two levels from my master table and have a left join on my second table, but because of the ordering within my query this will not work. SELECT something FROM master as parent, master as child LEFT JOIN second as parentdata ON parent.secondary_id = parentdata.id LEFT JOIN second as childdata ON child.secondary_id =

问题 I'm having difficulties using the LEFT OUTER JOIN in multiple tables. My tables are: countries , customer_info , package_types , service_types and shipping_info This is my code so far: $sql = "SELECT shipping_info.shipping_id, shipping_info.weight, shipping_info.width, shipping_info.height, shipping_info.length, shipping_info.cost, shipping_info.status, service_types.service, package_types.package_type, countries1.country AS fromCountry, countries2.country AS toCountry, countries3.country AS

问题 I'm having difficulties using the LEFT OUTER JOIN in multiple tables. My tables are: countries , customer_info , package_types , service_types and shipping_info This is my code so far: $sql = "SELECT shipping_info.shipping_id, shipping_info.weight, shipping_info.width, shipping_info.height, shipping_info.length, shipping_info.cost, shipping_info.status, service_types.service, package_types.package_type, countries1.country AS fromCountry, countries2.country AS toCountry, countries3.country AS

问题 I'm having difficulties using the LEFT OUTER JOIN in multiple tables. My tables are: countries , customer_info , package_types , service_types and shipping_info This is my code so far: $sql = "SELECT shipping_info.shipping_id, shipping_info.weight, shipping_info.width, shipping_info.height, shipping_info.length, shipping_info.cost, shipping_info.status, service_types.service, package_types.package_type, countries1.country AS fromCountry, countries2.country AS toCountry, countries3.country AS

问题 I have two tables table1 and table2 CREATE TABLE TABLE1 ( EMPLID VARCHAR2(11) NOT NULL, COMPANY VARCHAR2(3) NOT NULL, EMPL_RCD SMALLINT NOT NULL, BALANCE_ID VARCHAR2(2) NOT NULL, BALANCE_YEAR SMALLINT NOT NULL, BALANCE_QTR SMALLINT NOT NULL, BALANCE_PERIOD SMALLINT NOT NULL, SPCL_BALANCE VARCHAR2(1) NOT NULL, ERNCD VARCHAR2(3) NOT NULL, HRS_QTD DECIMAL(13, 2) NOT NULL, GRS_QTD DECIMAL(13, 2) NOT NULL, HRS_YTD DECIMAL(13, 2) NOT NULL, GRS_YTD DECIMAL(13, 2) NOT NULL, HRS_MTD DECIMAL(13, 2) NOT

问题 The table tbl has a column xml_data of type XMLTYPE. Consider the following XML: <root> <element> <id>1</id> <data>abc</data> </element> <element> <id>2</id> <data>def</data> </element> </root> I need a select statement that will return 1 row for each row in tbl, with 3 columns: id1, id2 & id3. id1 will get the value of the "data" tag from the "element" node where the "id" is 1. id2 will get the value from the node where "id" is 2, etc. In case there is no element for a certain id (like id3

问题 I have two tables one called permissions and one called roles which are related through a third table called RolePermissions in a N-N relationship. Permissions id <- PK name Roles id <- PK name RolePermisions RoleId <-PK PermissionId <-PK isAllowed What I want is to get the full list of permissions of a specific role, and NULLs when there isn't a value in the RolePermission table for that Role. Left joins usually do the trick, but I can't work this one out. Basically let's say I have the

问题 My query must allow repeated values in certain columns, but I want it to return a null in the query when a repeated value occurs. The following two images show my problem: What it returns now What I want it to return: SQL Query: SELECT * FROM completo_sem_saldo AS a LEFT JOIN posicao_contabil AS b ON (a.Cliente = b.Cliente_Posicao) LEFT JOIN saldo_analitico AS c ON (a.Cliente = c.Cliente_Saldo_Analitico) LEFT JOIN titulos_em_ser AS d ON (a.Cliente = d.Cliente_Titulos_Em_Ser) 回答1: You could do

问题 I already tried various types of JOINS but I am not able to get this simple query to work. I would like to have the result of table a in any case, even if there is no corresponding entry in table b. I tried: SELECT a.user_id, a.user_name, b.first_name FROM users a LEFT OUTER JOIN members b ON a.member_uid = b.uid WHERE (a.user_name = 'TEST' AND b.active = 1) In this case, there is no entry in b that has b.active = 1. But I assumed that all wanted columns from a would be returned and the

问题 this is table1 id1 Name ------------ 1 value1 2 value2 this is table2 id2 Name id1 --------------------- 1 value1 2 2 value2 1 this is table3 id3 Name id2 --------------------- 1 value1 2 2 value2 1 this is table4 id4 Name id3 --------------------- 1 value1 2 2 value2 1 I Want to join above 4 tables in Yii2 with model select * from table1 left join table2 on table2.id2 = table1.id1 left join table3 on table2.id3 = table1.id2 left join table4 on table2.id4 = table1.id3 回答1: 1. Use Yii2