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sql if else then知識摘要

(共計:20)
  • The IF...THEN...ELSE Statement : IF « PL SQL Statements « Oracle PL/SQL Tutorial
    The IF...THEN...ELSE Statement : IF « PL SQL Statements « Oracle PL/SQL Tutorial ... some_condition_evaluates_to_true, tests a BOOLEAN condition that you provide. If true, the second parameter, perform_statements_condition_true, executes.

  • sql server - Can you have if-then-else logic in SQL? - Stack Overflow
    I need to do select data from a table based on some kind of priority like so: select product, price from table1 where project = 1 -- pseudo: if no price found, do this: select product, price from ... With SQL server you can just use a CTE instead of IF/TH

  • Use IF THEN ELSE IF : IF « PL SQL Statements « Oracle PL/SQL Tutorial
    Use IF THEN ELSE IF : IF « PL SQL Statements « Oracle PL/SQL Tutorial ... SQL> SQL> SET SERVEROUTPUT ON SQL> SET ECHO ON SQL> DECLARE 2 employee_name_c CHAR(32); 3 employee_name_v VARCHAR2(32); 4 BEGIN 5 --Assign ...

  • sql - IF EXISTS, THEN SELECT ELSE INSERT AND THEN SELECT - Stack Overflow
    How do you say the following in Microsoft SQL Server 2005: IF EXISTS (SELECT * FROM Table WHERE FieldValue='') THEN SELECT TableID FROM Table WHERE FieldValue='' ELSE INSERT INTO TABLE(Field...

  • in SQL SELECT, how to perform "IF .. THEN .. ELSE " ? - Microsoft Community
    Hello, I am trying to select a between two fields. Looking around web sites and " CASE .. WHEN .. THEN .. ELSE .. END " seems popular. In SQL SECECT statement, I trying to ...

  • PL/SQL IF THEN ELSE Statements | Conditional Control
    PL/SQL IF THEN ELSE conditional control statements. PL/SQL Conditional Control two type: IF THEN ELSE statement and CASE statement. ... Nested IF THEN ELSE Statement Logically IF THEN ELSIF Statement and Nested IF THEN ELSE Statement both ...

  • sql server - Can you have if-then-else logic in SQL? - Stack Overflow
    This question already has an answer here: How do you perform an IF ... You can make the following sql query. IF ((SELECT COUNT(*) FROM ...

  • sql server - How do you perform an IF...THEN in an SQL SELECT ...
    The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server ..... From this link: IF THEN ELSE in T-SQL ...

  • SQL Server: CASE WHEN OR THEN ELSE END => the OR is not ...
    SQL Server: CASE WHEN OR THEN ELSE END => the OR is not ... It more closely fits the OP's question, and if you want to nest some ...

  • Using IF...ELSE - TechNet - Microsoft
    The IF statement is used to test for a condition. ... SQL Server 2008 R2 ... Then control jumps to the point after the statement, or block of statements, following the  ...

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