JOIN dbSecurity.dbo.AccountInstSecurityRole s ON s.InstitutionID = CASE WHEN (RecordCount) <= 1 THEN v.ParentInstitutionID ELSE v.InstitutionID END Here is the full example USE dbTechnikons -- Gets all the child records for the intitution SELECT v.InstitutionID, v.Name, v.HierarchyLevelID...
selectdept.name,count(teacher.name) from teacher right join dept onteacher.dept=dept.idGROUP BYdept.name; Using CASE 9.Use CASE to show the name of each teacher followed by 'Sci' if the teacher is in dept 1 or 2 and 'Art' otherwise. 请使用CASE显示每个教师的姓名,如果教师在部门1或2中...
You can see where this UNION formulation would be less efficient than the previous CASE formulation. In the UNION example SQL Server would have to make four passes through the data—one for each SELECT used. In the CASE example, one pass through the data is sufficient to return the correct ...
问IN子句中的Using CASE语句EN这是我一直试图正确编译的内容的简化版本：条件语句中的else 什么是else e...
, IN v_str varchar(30) ) BEGIN CASE n_str WHEN n_str = 'profileStatus' THEN UPDATE tbl_contact SET status = 'A' WHERE id = id; -- The above statement updates the entire table instead of the right row WHEN n_str = 'phoneNumberMobile' THEN ...
This is a great equality expression case statement in SQL. What it basically means is that we can do Case followed by the field name and then we can have all case expressions. In this particular case, whenever “Gender” equals “F” then it’s going to output “Female” and when it ...
Use CASE to show the name of each teacher followed by ‘Sci’ if the teacher is in dept 1 or 2, show ‘Art’ if the teacher’s dept is 3 and ‘None’ otherwise. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 select teacher.name,casewhen teacher.dept=1or teacher.dept=2then'Sci...
T-SQL GETDATE() ? ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column i...
Note: Oracle internally creates unique index to prevent duplication in the column values.Indexes would be discussed later in PL/SQL.CREATE TABLE TEST ( ... , NAME VARCHAR2(20) CONSTRAINT TEST_NAME_UK UNIQUE, ... );In case of composite unique key,it must be defined at table level as ...
, IN v_str varchar(30) ) BEGIN CASE n_str WHEN n_str = 'profileStatus' THEN UPDATE tbl_contact SET status = 'A' WHERE id = id; -- The above statement updates the entire table instead of the right row WHEN n_str = 'phoneNumberMobile' THEN ...