Question

我可以用这种方式计数行吗？

    SELECT COUNT(SERVICE_TYPE) INTO N_CNT FROM (
          SELECT RECIPIENT, SERVICE_TYPE, MPS_SWTCH_CD, MPS_FTR_CD1 FROM ABA_RM_INB_USAGE
                                                         WHERE SERVICE_TYPE = 100 AND
                                                               MPS_SWTCH_CD = 'T11' AND
                                                               MPS_FTR_CD1 = 1033);

Answer 1

您可以像这样计算行而不是列，关键字INTO是多余的，如果我修改查询，如下所示，

SELECT COUNT(SERVICE_TYPE) N_CNT FROM (
          SELECT RECIPIENT, SERVICE_TYPE, MPS_SWTCH_CD, MPS_FTR_CD1 FROM ABA_RM_INB_USAGE
                                                         WHERE SERVICE_TYPE = 100 AND
                                                               MPS_SWTCH_CD = 'T11' AND
                                                               MPS_FTR_CD1 = 1033)a;

您也可以在没有子查询的情况下进行计数

SELECT Count(*) N_CNT
FROM ABA_RM_INB_USAGE
WHERE SERVICE_TYPE = 100 AND
MPS_SWTCH_CD = 'T11' AND MPS_FTR_CD1 = 1033;

Answer 2

如另一个答案中所述，您的语句用于计数行。如果您想计算表的列数，请尝试如下操作。

请参见this post

SELECT COUNT(*)
  FROM INFORMATION_SCHEMA.COLUMNS
 WHERE table_catalog = 'database_name' -- the name of your database
   AND table_name = 'table_name' -- the table you want to count columns in

计算选定的行

2 个答案: