DB2 递归SQL 根据当前机构查询所有下属机构树
CREATE TABLE UNTECK_ORGANIZATION ( ID BIGINT NOT NULL, LEVEL_ INTEGER, NAME VARCHAR(64), AREACODE VARCHAR(8), ORGSEQ VARCHAR(128), PARENTID BIGINT, THESORT INTEGER, DESCN VARCHAR(256), DEL_FLAG INTEGER, CREATE_TIME TIMESTAMP, CREATE_USER V
CREATE TABLE UNTECK_ORGANIZATION (
ID BIGINT NOT NULL,
LEVEL_ INTEGER,
NAME VARCHAR(64),
AREACODE VARCHAR(8),
ORGSEQ VARCHAR(128),
PARENTID BIGINT,
THESORT INTEGER,
DESCN VARCHAR(256),
DEL_FLAG INTEGER,
CREATE_TIME TIMESTAMP,
CREATE_USER VARCHAR(64),
UPDATE_TIME TIMESTAMP,
UPDATE_USER VARCHAR(64),
CODE VARCHAR(64),
ADDRESS VARCHAR(255),
CELLPHONE VARCHAR(24),
ORGTYPE VARCHAR(20),
PRIMARY KEY (ID) );
with temptab(ID,NAME,CODE,PARENTID) as
(select a.ID,a.NAME,a.CODE,a.PARENTID
from UNTECK_ORGANIZATION a
where a.ID = 3413585099
union all
select sub.ID,sub.NAME,sub.CODE,sub.PARENTID
from UNTECK_ORGANIZATION sub, temptab super
where sub.PARENTID = super.ID
)
select ID,NAME,CODE,PARENTID from temptab

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The recursion depth of C++ functions is limited, and exceeding this limit will result in a stack overflow error. The limit value varies between systems and compilers, but is usually between 1,000 and 10,000. Solutions include: 1. Tail recursion optimization; 2. Tail call; 3. Iterative implementation.

HQL and SQL are compared in the Hibernate framework: HQL (1. Object-oriented syntax, 2. Database-independent queries, 3. Type safety), while SQL directly operates the database (1. Database-independent standards, 2. Complex executable queries and data manipulation).

Yes, C++ Lambda expressions can support recursion by using std::function: Use std::function to capture a reference to a Lambda expression. With a captured reference, a Lambda expression can call itself recursively.

The recursive algorithm solves structured problems through function self-calling. The advantage is that it is simple and easy to understand, but the disadvantage is that it is less efficient and may cause stack overflow. The non-recursive algorithm avoids recursion by explicitly managing the stack data structure. The advantage is that it is more efficient and avoids the stack. Overflow, the disadvantage is that the code may be more complex. The choice of recursive or non-recursive depends on the problem and the specific constraints of the implementation.

Tail recursion optimization (TRO) improves the efficiency of certain recursive calls. It converts tail-recursive calls into jump instructions and saves the context state in registers instead of on the stack, thereby eliminating extra calls and return operations to the stack and improving algorithm efficiency. Using TRO, we can optimize tail recursive functions (such as factorial calculations). By replacing the tail recursive call with a goto statement, the compiler will convert the goto jump into TRO and optimize the execution of the recursive algorithm.

A recursive function is a technique that calls itself repeatedly to solve a problem in string processing. It requires a termination condition to prevent infinite recursion. Recursion is widely used in operations such as string reversal and palindrome checking.

Recursive definition and optimization: Recursive: A function calls itself internally to solve difficult problems that can be decomposed into smaller sub-problems. Tail recursion: The function performs all calculations before making a recursive call, which can be optimized into a loop. Tail recursion optimization condition: recursive call is the last operation. The recursive call parameters are the same as the original call parameters. Practical example: Calculate factorial: The auxiliary function factorial_helper implements tail recursion optimization, eliminates the call stack, and improves efficiency. Calculate Fibonacci numbers: The tail recursive function fibonacci_helper uses optimization to efficiently calculate Fibonacci numbers.

The following techniques are available for debugging recursive functions: Check the stack traceSet debug pointsCheck if the base case is implemented correctlyCount the number of recursive callsVisualize the recursive stack
