Display String Having Length Greater Than 255

I have a created a table and entered data into the table as follows:

CREATE TABLE t ( id INT , txtcol varchar(1000) )

INSERT INTO t ( id , txtcol ) VALUES ( 1 , 'ATXR_SOURCE_ID,CDDL_AG_PRICE,CDDL_ALLOW,CDDL_ALTDP_EXCD_ID,CDDL_CAP_IND,CDDL_CHG_AMT,CDDL_COINS_AMT,CDDL_CONSIDER_CHG,CDDL_COPAY_AMT,CDDL_DED_AC_NO,CDDL_DED_AMT,CDDL_DIS_PA_LIAB,CDDL_DISALL_AMT,CDDL_DISALL_EXCD,CDDL_DISC_AMT,CDDL_DP_PRICE,CDDL_FROM_DT,CDDL_PAID_AMT,CDDL_PF_PRICE,CDDL_PR_PYMT_AMT,CDDL_PRICE_IND,CDDL_REF_IND,CDDL_RISK_WH_AMT,CDDL_SB_PYMT_AMT,CDDL_SURF,CDDL_TOOTH_BEG,CDDL_TOOTH_END,CDDL_TOOTH_NO,CDDL_TOT_PA_LIAB,CDDL_UNITS,CDDL_UNITS_ALLOW,CGCG_ID,CGCG_RULE,DPCG_DP_ID_ALT,DPDP_ID,DPTC_CD,PDVC_LOBD_PTR,PSDC_ID,UTUT_CD' )

Now if i select data using the query below the txtcol field displays only 255 characters :

SELECT * FROM t

Y is this happening?