使用临时表存储 IN 子句中的值列表,然后进行连接查询。 参考链接 SQL Server WHERE Clause SQL Server IN Operator SQL Server IF...ELSE Statement 通过以上信息,你应该能够更好地理解 SQL Server 中 IF 条件和 WHERE 子句中的 IN 运算符,并能够解决相关的性能问题。相关搜索:
To do this, ensure thesql_transpilerparameter ison(it'soffby default). When a function in thewhereclause is transpiled, you can see the case expression instead of the function in the predicate section of the plan: There are a few differences betweencasein PL/SQL andOracle SQL. Using case ...
FOR i IN 1..500 LOOP Insert INTO t1 VALUES (i); END LOOP; END; / Select COUNT(*) FROM t1; COMMIT; Create or REPLACE FUNCTION p (c_in NUMBER) RETURN NUMBER IS PRAGMA AUTONOMOUS_TRANSACTION; BEGIN -- Every time this is called, write a row to table t2 Insert INTO t2 VALUES (c_...
FOR i IN 1..500 LOOP Insert INTO t1 VALUES (i); END LOOP; END; / Select COUNT(*) FROM t1; COMMIT; Create or REPLACE FUNCTION p (c_in NUMBER) RETURN NUMBER IS PRAGMA AUTONOMOUS_TRANSACTION; BEGIN -- Every time this is called, write a row to table t2 Insert INTO t2 VALUES (c_...
DELIMITER // CREATE PROCEDURE CheckSalary(IN emp_name VARCHAR(255)) BEGIN DECLARE emp_salary INT; -- 使用SELECT查询获取员工的薪水 SELECT salary INTO emp_salary FROM employees WHERE name = emp_name; -- 使用IF语句根据薪水进行判断 IF emp_salary > 5000 THEN SELECT CONCAT('Employee ', emp_...
SQL> alter table if exists t1 add (id number); alter table if exists t1 add (id number) * ERROR at line 1: ORA-01430: column being added already exists in table SQL> CREATE OR REPLACE We can't mixCREATE OR REPLACEand theIF NOT EXISTSclause. ...
在Oracle SQL中使用IF子句是否可行？一种方法是将UNION ALL与表和默认值一起使用，然后进行聚合：...
对应的sql delete from tbl_employee where id in (1,2,3); delete from tbl_employee where id = 1 or id = 2 or id = 3 1. 2. 方式一 通过id所组成的字符串实现批量删除 Mapper接口 //通过id所组成的字符串实现批量删除 public void deleteMoreEmp(String eids); ...
<if test="orderByClause != null"> order by ${orderByClause} </if> <include refid="OracleDialectSuffix" /> 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. sql语句,用来查询数量的: <!-- WARNING...
在Oracle SQL中使用IF子句是否可行？一种方法是将UNION ALL与表和默认值一起使用，然后进行聚合：...