sql server case sensitive compare

Compare SQL Server, Oracle, and DB2 I. Openness: SQL ServerIt can only run on windows without any openness. The stability of the operating system is very important to the database.The Windows9x series products focus on desktop applications, and the NT Server is only s

] EXCEPT SELECT * from [dbo].[t1_new] ) asT;SELECT * from [dbo].[t1_new]SELECT * from [dbo].[T1_old]If the results are not correct, then the inconsistent conclusions are given directly.Method Four: Use the full table inner JOIN, this is also the worst practice, of course, this refers to the table records in the case of super-many casesDECLARE @t1_newcount BIGINTDECLARE @count BIGINTSELECT @t1_newcount = C

1. Character functions: The characters in SQL Server are case-insensitive.However, the lower and upper functions are common in SQL Server, Oracle, and DB2. For example, select empno, ename, deptno from EMP where upper (ename) = upper ('bucket '); Example of connection chara

* from [dbo].[t1_new] ) asT;SELECT * from [dbo].[t1_new]SELECT * from [dbo].[T1_old]If the results are not correct, then the inconsistent conclusions are given directly.Method Four: Use the full table inner JOIN, this is also the worst practice, of course, this refers to the table records in the case of super-many casesDECLARE @t1_newcount BIGINTDECLARE @count BIGINTSELECT @t1_newcount = COUNT(*) fromt1_new;SELECT @count

The constraint is used to force the row data to meet specific business rules (the data type is to force the column data to meet the rules)There are five types of constraints: • not null • unique • primary key • Foreign key • check the not null constraint on SQL Server: • Create Table u_emp (• empno bigint, • ename varchar (10) Not null, • job varchar (9), • Mgr bigint, • hiredate date, • Sal decimal (7,2),

Start A while ago, a project encountered such an SQL query requirement. There were two tables with the same structure (table_left table_right), as shown below: Figure 1. Check whether there is a group of (groupId) data in table table_right that is exactly the same as its data. 1. We can see that the table_left and table_right tables have two groups of data that are completely equal: Figure 2. Analysis From the above two tables, we can know that the

ROUPID=A.GROUPID) Method 1 Vs. Method 2: Both Method 1 and Method 2 can be used to find the group #11 in which the table Table_left exists exactly equal in table_right data. However, in terms of performance, Method 2 is more slightly than Method 1 to see the statistical information of their execution process: Method 1: Figure 5. Method 2: Figure 6. If the data volume is large, then method 2 has more obvious advantages than Method 1. Because of Method 1, more than two update datapa

In the data room charging system, there are several such situations: Start date and end date. I believe you are smart enough to figure out why there are two date controls! Yes, it is to find records in these two date ranges from a table! Some people just said, it's not easy! Suppose we define the first control as Begin, and the second control as Over! The query statement is notCopy codeThe Code is as follows:"Select * from recharge_info where date What's the problem! However, the fact is not tha

Start A while ago, a project encountered such an SQL query requirement. There were two tables with the same structure (table_left table_right), as shown below: Figure 1. Check whether there is a group of (groupId) data in table table_right that is exactly the same as its data. 1. We can see that the table_left and table_right tables have two groups of data that are completely equal: Figure 2. Analysis From the above two tables, we can know that the

An index is a database object used to accelerate database queries. The principle is to reduce the IO operations of the query to accelerate. Index types:• Clustered index: sort and store the data rows according to the key values of the data rows in the table or view. • Non-clustered index: it has a structure independent of data rows. • unique index: Make sure that the index key does not contain duplicate values. Indexes created on SQL

The syntax of the create statement is the same, and the data types are different. However, the syntax for creating a table using subqueries is different. SQL Server statements created using subqueries:Select empno, ename, Sal * 12 annsal, hiredate into dept30 from EMP where deptno = 30; Oracle uses query to create a table:Create Table dept30 Select empno, ename, Sal * 12 annsal, hiredate From EMP Where de

@t1_newcount=COUNT (*)FromT1_new;SELECT@count=COUNT (*)From[T1_old]AsAINNERJOIN[T1_new]As BOn[B].[Id]=[A].[Id]and[B].[Log_time]=[A].[Log_time]-- If there are other fields in the table that you add yourself print print @t1_newcount if ( @count = @t1_newcount ) begin ' equal "end else begin select Span style= "color: #ff0000;" > ' Method five: With SQL Server's own Tablediff tool, Microsoft made this tool to comp