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Database management --- Databases --- Congresses --- -681.3*H21 --- 681.3*H23 --- Data banks --- Data bases --- Databanks --- Database systems --- Computer files --- Electronic information resources --- Congresses. --- Logical design: data models; normal forms; schema and subschema (Database management) --- Languages: data description languages; DDL; data manupulation languages; DML;query languages; report writers (Database management) --- 681.3*H23 Languages: data description languages; DDL; data manupulation languages; DML;query languages; report writers (Database management) --- 681.3*H21 Logical design: data models; normal forms; schema and subschema (Database management) --- 681.3*H21 --- Database management - Congresses --- Databases - Congresses