將SQL Server/T-SQL查詢轉換爲Oracle PL/SQL

Question

我有一個需要轉換爲Oracle PL-SQL的SQL Server T-SQL查詢。

我的SQL Server查詢是：

DECLARE @inputData 

BEGIN 
    SELECT @inputData = column_name 
    FROM table; 
END 

是什麼select DECLARE variable = column_name from any table辦？

編輯

我曾嘗試對我自己的研究這一點，但無法找到一個適當的解釋。 這裏所謂的專家的SOME不喜歡這裏的小塊代碼是我正在嘗試爲oracle進行翻譯的整個過程。

USE [Mon422_GA] 
    GO 
    /****** Object: StoredProcedure [dbo].[p_DisbAmtCheck] Script Date:  1/18/2017 11:33:19 AM ******/ 
    SET ANSI_NULLS ON 
    GO 
    SET QUOTED_IDENTIFIER ON 
    GO 

ALTER         PROCEDURE [dbo].[p_DisbAmtCheck] 
(
    @amount decimal(18,2), 
@type nvarchar(10), 
    @id int, 
    @app_id int, 
    @loan_id int, 
    @disb_fee_id int = 0, 
    @disb_cs_fees nvarchar(255) = '0' 
) 
AS 
BEGIN 
    DECLARE @TOTAL_DISB decimal(18,2), @DISB_DISB decimal(18,2), @FEE_DISB   decimal(18,2), 
     @WRK_TOTAL decimal(18,2), @CUR_DISB decimal(18,2), @FEE_CLOSE char(1), 
     @FEE_FIN char(1), @TMP_SQL nvarchar(512) 
SET @TOTAL_DISB = 0.00 
SET @DISB_DISB = 0.00 
SET @FEE_DISB = 0.00 
SET @WRK_TOTAL = 0.00 
SET @CUR_DISB = 0.00 
IF @type NOT LIKE 'cs_disb' 
BEGIN 
    SELECT @DISB_DISB = SUM(d.disburse_amt) 
    FROM t_ccs_disburse d, t_ccs_loan_disburse_rel ldr, t_ccs_app_loan_rel alr 
    WHERE ldr.disburse_id = d.disburse_id AND ldr.loan_id = alr.loan_id 
     AND alr.app_id = @app_id AND alr.loan_id = @loan_id 
     AND d.disburse_loan_fee_ind != 'F' 
END 
IF @DISB_DISB IS NULL 
    SET @DISB_DISB = 0.00 
IF @type NOT LIKE 'cs_fee' 
BEGIN 
    SET @TMP_SQL = 'SELECT SUM(f.fee_amt) 
     FROM t_ccs_fee f, t_ccs_app_fee_rel r 
     WHERE r.fee_id = f.fee_id 
     AND r.app_id = ' + CONVERT(NVARCHAR, @app_id) + 
     ' AND r.loan_id = ' + CONVERT(NVARCHAR, @loan_id) + ' 
     AND (fee_financed_yn = ''Y'' OR fee_collect_at_closing_yn = ''Y'') 
     AND f.fee_id NOT IN (' 
    IF LEN(@disb_cs_fees) > 0 
     SET @TMP_SQL = @TMP_SQL + @disb_cs_fees + ')' 
    ELSE 
     SET @TMP_SQL = @TMP_SQL + '0)' 
    EXEC ('DECLARE fees CURSOR FOR '+ @TMP_SQL) 
    OPEN fees 
    FETCH NEXT FROM fees INTO @FEE_DISB 
    CLOSE fees 
    DEALLOCATE fees 
END 
IF @FEE_DISB IS NULL 
    SET @FEE_DISB = 0.00 
SELECT @TOTAL_DISB = ln_amount FROM t_ccs_loan WHERE loan_id = @loan_id 
IF @TOTAL_DISB IS NULL 
    SET @TOTAL_DISB = 0.00 
SET @WRK_TOTAL = @DISB_DISB + @FEE_DISB + @amount 
IF @WRK_TOTAL IS NULL 
    SET @WRK_TOTAL = 0.00 
IF @id > 0 
BEGIN 
    IF @type LIKE 'fee' 
     SELECT @CUR_DISB = fee_amt FROM t_ccs_fee WHERE fee_id = @id 
    ELSE IF @type LIKE 'disb' 
     SELECT @CUR_DISB = disburse_amt FROM t_ccs_disburse WHERE disburse_id = @id 
    ELSE 
     SET @CUR_DISB = 0.00 
    IF @CUR_DISB IS NULL 
     SET @CUR_DISB = 0.00 
END 
ELSE 
BEGIN 
    SET @CUR_DISB = 0.00 
    IF @type LIKE 'disb' 
    BEGIN 
     -- check to see if this fee is financed or collect at close if so subtract from total 
     SELECT @FEE_FIN = fee_financed_yn, @FEE_CLOSE = fee_collect_at_closing_yn 
     FROM t_ccs_fee WHERE fee_id = @disb_fee_id 
     IF @FEE_FIN = 'Y' OR @FEE_CLOSE = 'Y' 
      SET @WRK_TOTAL = @WRK_TOTAL - @amount 
    END 
END 
SET @WRK_TOTAL = @WRK_TOTAL - @CUR_DISB 
IF @WRK_TOTAL > @TOTAL_DISB 
    SELECT '0' as PASSED 
ELSE 
    SELECT '1' as PASSED 

END 我不認爲它的任何問題的重複這樣Intially我剛剛發佈我的代碼小部分。由於一些所謂的專家不喜歡它，所以這裏是我需要在oracle中進行翻譯的完整代碼。我曾問過，但我有很難理解這是什麼 選擇anydeclaredvariable =列名來自anytable做的情況下

？

Answer 1

重要區別在於，在MS

SELECT @inputData = column_name FROM table; 

運行行即使沒有謂詞即具有multirows結果集，在從任意行返回的column_name值。在Oracle

如果結果集包含超過一行

SELECT column_name INTO input_data FROM my_table; 

將失敗。 你不應該只是不經意地翻譯語法。

Answer 2

變量=列名

列的值賦予您的變量。

像這樣的東西應該在甲骨文工作：

declare 
    input_data my_table.my_column%type; 
begin 
    select my_column into input_data from my_table where /* some predicate(s) */; 
end; 
/

Answer 3

你的問題問

是什麼DECLARE variable = column_name辦？

聲明：DECLARE @Variable int = 5將創建一個名爲@Variable變量並初始化其內容的價值5。

如果您的問題反而是：「這是什麼SELECT @inputData = column_name FROM table做」，那麼答案是，它賦予返回column_name到變量@inputData值。

我希望這能回答你的問題。 MS SQL和Oracle之間