PL/SQL 语句被忽略：缺少表达式

Question

我有一个带有 3 个表的小数据库：account、account_statements 和 account operations。我需要知道：

1. 本期所有信贷操作

2. perion的所有debet操作

3. 任何日期的余额

我的脚本是：

    CREATE TABLE account 
(
   id number(10) NOT NULL,
   account number(20) NOT NULL,
   CONSTRAINT account_id PRIMARY KEY (id)
);


CREATE TABLE account_statements
(
   id number(10) NOT NULL,
   account_id number(10) NOT NULL,
   statement_date date,
   inbalance number(20,2),
   outbalance number (20,2),
   CONSTRAINT statement_id PRIMARY KEY (id),
   CONSTRAINT account_statements_foreign_id FOREIGN KEY (account_id) REFERENCES account(id)
);


CREATE TABLE account_operations
(
   id number(10) NOT NULL,
   account_id number(10) NOT NULL,
   operdate date,
   summ number(20,2),
   opertype char(6),
   CONSTRAINT operations_id PRIMARY KEY (id),
   CONSTRAINT account_operations_foreign_id FOREIGN KEY (account_id) REFERENCES account(id)
);

CREATE OR REPLACE FUNCTION Get_debet_on_period (
   v_startdate IN date,
   v_enddate IN date,
   v_account IN account.account%TYPE)
RETURN number
IS
   v_debet_summ number(20,2);
BEGIN
   SELECT SUM(summ) INTO v_debet_summ
   FROM account_operations ao,
      account a
   WHERE ao.operdate between v_startdate AND v_enddate
      AND ao.opertype='DEBET'
      AND a.account=v_account
      AND ao.account_id=a.id;

    RETURN v_debet_summ;
END;

CREATE OR REPLACE FUNCTION Get_credit_on_period (
   v_startdate IN date,
   v_enddate IN date,
   v_account IN account.account%TYPE)
RETURN number
IS
   v_credit_summ number(20,2);
BEGIN
   SELECT SUM(summ) INTO v_credit_summ
   FROM account_operations ao,
      account a
   WHERE ao.operdate between v_startdate AND v_enddate
      AND ao.opertype='CREDIT'
      AND a.account=v_account
      AND ao.account_id=a.id;
    RETURN v_credit_summ;
END;

CREATE OR REPLACE FUNCTION Get_balance_on_date (
   v_date IN date,
   v_account IN account.account%TYPE)
RETURN number
IS 
   v_balance_summ number(20,2);
   v_startdate date; 
   v_startsumm number;
BEGIN
   SELECT MAX(as.statement_date) INTO v_startdate
   FROM account_statements as, account a
   WHERE a.id=as.account_id
   AND a.account=v_account
   AND as.statement_date<v_date;
   IF v_startdate IS NOT NULL THEN
      SELECT as.outbalance INTO v_startsumm
      FROM account_statement as, account a
      WHERE a.id=as.account_id
      AND a.account=v_account
      AND as.statement_date=v_statement_date;
      v_balance_summ:=v_startsumm+Get_credit_on_period(v_startdate, v_date, v_account)-Get_debet_on_period(v_startdate, v_date, v_account);
    ELSE
      v_startsumm:=0;
      v_balance_summ:=Get_credit_on_period(v_startdate, v_date, v_account)-Get_debet_on_period(v_startdate, v_date, v_account);
    END IF;

   RETURN v_balance_summ;
END;

Get_balance_on_date 函数出错：

错误：FUNCTION GET_BALANCE_ON_DATE 行/列：10/4 PL/SQL：SQL 语句忽略行/列：10/15 PL/SQL：ORA-00936：缺失 表达式行/列：16/7 PL/SQL：忽略 SQL 语句行/列： 16/14 PL/SQL：ORA-00936：缺少表达式

Answer 1

您的函数get_balance_on_date 无法编译。

1. 您正在使用表 account_statement，但是您创建了以复数形式命名的表 account_statements。
2. 您使用保留关键字AS 作为别名“account_statements as”。您应该将别名更改为不同的名称。
3. 您正在使用未声明的变量“v_statement_date”。

给你的固定功能：

CREATE OR REPLACE FUNCTION get_balance_on_date
(
    v_date    IN DATE
   ,v_account IN account.account%TYPE
) RETURN NUMBER IS
    v_balance_summ NUMBER(20, 2);
    v_startdate    DATE;
    v_startsumm    NUMBER;
    v_statement_date DATE; -- Remove this if you don't need, created this for function to compile
BEGIN
    SELECT MAX(stm.statement_date)
      INTO v_startdate
      FROM account_statements stm
          ,account            a
     WHERE a.id = stm.account_id
       AND a.account = v_account
       AND stm.statement_date < v_date;

    IF v_startdate IS NOT NULL
    THEN
        SELECT stm.outbalance
          INTO v_startsumm
          FROM account_statements stm
              ,account           a
         WHERE a.id = stm.account_id
           AND a.account = v_account
           AND stm.statement_date = v_statement_date;

        v_balance_summ := v_startsumm +
                          get_credit_on_period(v_startdate, v_date, v_account) -
                          get_debet_on_period(v_startdate, v_date, v_account);
    ELSE
        v_balance_summ := get_credit_on_period(v_startdate, v_date, v_account) -
                          get_debet_on_period(v_startdate, v_date, v_account);
    END IF;

    RETURN v_balance_summ;
END;

Answer 2

您正在使用保留关键字作为别名

FROM account_statements as, account a

as 必须更改为其他内容，因为它是 SQL 语言的一部分。