sql oracle case statement in where clause

; Example: Declare V_count number; Begi Select count (*) into v_count from cip_temps; Case v_count When 1 then Dbms_output.put_line ('when 1 operation ___ v_cont value: '| v_count ); When 5 then Dbms_output.put_line ('when 5 Operation ___ v_count value: '| v_count ); When 10 then Dbms_output.put_line ('when 10 Operator ____ v_count value: '| v_count ); Else Dbms_output.put_line ('else operator ____ v_cout value: '| v_count

the database (that is, files on the hard disk)The data in the disk can only be achieved through the instance, and files on the hard disk cannot be directly read. Differences:An instance can operate databases. At any time, an instance can only be associated with one database. In most cases, only one instance can operate on a database. 3. Note The SQL language is case insensitive, but the words in the where

indicates passing the test. If the value is less than 60, it indicates failing.Display format:Chinese, mathematics, and EnglishPass excellent fail------------------------------------------Select(Case when language> = 80 then 'excellent'When language> = 60 then 'pass'Else 'failed') as language,(Case when mathematics> = 80 then 'excellent'When mathematics> = 60 then 'pass'Else 'failed') as mathematics,(

statement syntax The code is as follows Copy Code case [Expression]When Condition_1 THEN result_1When Condition_2 THEN result_2...When Condition_n THEN result_nELSE resultEnd expression is optional. It's worth the list of conditions that you compare. (ie: condition_1,condition_2, ... condition_n) Condition_1 to Condition_n must be of the same data type. The order that

This afternoon colleagues asked me a more basic question, when splicing SQL statements, if encountered like the situation what to do.My original writing is a simple concatenation of strings, and later colleagues asked me what to do if I encountered SQL injection. I think about it, it's really a problem.Just on the Internet to find the relevant instructions, the original is so written.As such an

statements with simple statements. They are useful when you need to select rows from a table with data that depends on the table itself. You can put subqueries in many SQL clauses, including: WHERE clause, HAVING clause, FROM clause, CREATE VIEW statement, CREATE TABLE

SQL statement case when then else end returns a qualified value, sqlcase Case has two formats Simple Case functions and Case search functions: -- Simple Case function

specifically responsible for data extraction in the server-side process. The function is to return the queried data results to the client process to complete the entire query. Oracle SQL statement execution sequence (8) SELECT (9) DISTINCT (11) (1) FROM (3) JOIN (2) ON (4) WHERE (5) GROUP (6) WITH {CUBE | ROLLUP} (7) HAVING (10) ORDER 1) FROM: Perform Cartesian

Oracle SQL statement Optimization Although orm ing is used in the project, the optimization of the Oracle system is very valuable. Here we will summarize the commonly used statements from the perspective of SQL statements. 1. Optimization in the from field:

) b where a date=b. Date We might as well review the syntax of case.Case when there are two uses, one is similar to the example in the above simple cases function:Result ' wins '1' negative '20END There is also a case search function:Result=' win '1result=' Negative '20END Where result= ' wins ' can be replaced by other conditional expressions. If more than one case-when expre

Case has two formats. Simple case functions and case search functions. -- Simple case Function Case Sex When '1' Then Male' When '2' Then Female' Else 'Others' End -- Case search function

> Salary When salary > Salary ELSE NULL End Salary_class,--alias name COUNT (*) From Table_a GROUP by Case when salary When salary > Salary When salary > Salary When salary > Salary ELSE NULL end; 3. Other implementations of If-then-else3.1 DECODE () function Copy Code code as follows: Select decode (Sex, ' M ', ' Male ', ' F ', ' Female ', ' Unknown ') From employees; It appears that only

Grammar:Case SelectorWhen Exp1 then Res1When Exp2 then Res2When Exp3 then Res3...[ELSE RESN]EndSql> Declare2 Mygrade char (1): = ' A ';3 res varchar2 (20);4 begin5 Res: =6 Case Mygrade7 when ' A ' and ' The mark is 90-100 '8 when ' B ' and ' The mark is 80-90 '9 when ' C ' and ' The mark is 70-80 'When ' D ' and ' The mark is 60-70 'Once ' E ' then ' the mark is 0-60 'The END;Dbms_output.put_line (RES);The end;15/The Mark is 90-100PL/