sql server - [OLE DB Source [963]] Error -

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i have created data flow task containing oledb source , oledb destination. oledb source has data access mode of: sql command variable. variable called: sqlquery. design time value of sqlquery is:

select '' personno person

the ssis package throwing following error:

[ole db source [963]] error: "output column "personno" (1051)" failed because truncation occurred, , truncation row disposition on "output column "surname" (1051)" specifies failure on truncation. truncation error occurred on specified object of specified component.

i not understand error. however, if following seems work:

select '1111111111' personno person

can specify length of personno in sql query?

instead use null like

select null personno person

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