crystal 报表如何替换空字符串

SELECT
PRETEST_NUMBER,
STUDY_ANIMAL_NUMBER,
PHASE_NAME,
DAY_OF_PHASE,
FOOTNOTE_SYMBOL,
STORED_UNITS,
VALUE,
PARAM_ABBREVIATION,
MEASUREMENT_NAME,
SEX
FROM
PTS_REPORT.RPT_GENERALIZED_DATA
WHERE
rptjob_id='198522'
AND PARAM_ABBREVIATION IS NOT NULL
ORDER BY
STUDY_ANIMAL_NUMBER



sql
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