今天在生產數據庫執行時報ora-02287 此處不允許序號

類似：

SELECT distinct

SYS_GUID(),

‘Y’ ACTIVE,

‘N’ IsRedBack,

‘N’ IsInit,

1 VersionNo,

‘YS2’ || LPAD(STL.SQ_YS2.NEXTVAL, 9, ‘0’) ReceivableNo

from dual

經查使用序列是有限制的：

Restrictions on Sequence Values You cannot use CURRVAL and NEXTVAL in the

following constructs:

■ A subquery in a DELETE, SELECT, or UPDATE statement

■ A query of a view or of a materialized view

■ A SELECT statement with the DISTINCT operator

■ A SELECT statement with a GROUP BY clause or ORDER BY clause

■ A SELECT statement that is combined with another SELECT statement with the

UNION, INTERSECT, or MINUS set operator

■ The WHERE clause of a SELECT statement

■ The DEFAULT value of a column in a CREATE TABLE or ALTER TABLE statement

■ The condition of a CHECK constrain

所以我這里是犯了A SELECT statement with the DISTINCT operator，

修改為：

select SYS_GUID(),

‘YS2’ || LPAD(STL.SQ_YS2.NEXTVAL, 9, ‘0’) ReceivableNo,

T.*

FROM (

SELECT distinct

‘Y’ ACTIVE,

‘N’ IsRedBack,

‘N’ IsInit,

1 VersionNo

from dual

)T

這樣就可以避免 A query of a view or of a materialized view

和

A SELECT statement with the DISTINCT operator

總結

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