Mysql Kompakt
Version vom 13. August 2020, 10:38 Uhr von Thomas.will (Diskussion | Beiträge) (→Ausgabe nur gewisser Werte)
Datenbank erstellen
- create database my_db;
In Datenbank wechseln
- use my_db;
Tabelle erstellen
- create table my_table (kw int(4), tests int(16), labor int(16) , postiv int(16), prozent float);
Beschreibung der Tabelle anzeigen
- desc my_table;
Werte in Tabelle einfügen
- insert into my_table values(11,127457,114,7582,5.95);
- insert into my_table values(12,348619,152,23820,6.83);
- insert into my_table values(13,361515,151,31414,8.69);
- insert into my_table values(14,408348,200,36885,9.3);
Wert in einer Reihe ändern
- update my_table set labor=154 where kw=14;
Alle Werte einer Tabelle anzeigen
- select * from my_table;
Alle Werte in einer Tabelle löschen
- truncate table my_table;
Tabelle aus CSV Datei füllen
- Beispiel CSV Datei
- cat /var/lib/mysql-files/my.csv
kw,tests,labor,postiv,prozent 11,127457,114,7582,5.95 12,348619,152,23820,6.83 13,361515,151,31414,8.69 14,408348,154,36885,9.03 15,380197,164,30791,8.10 16,331902,168,22082,6.65 17,363890,178,18083,4.97 18,326788,175,12608,3.86 19,403875,182,10755,2.66 20,432666,183,7233,1.67 21,353467,179,5218,1.48 22,405269,178,4310,1.06 23,340986,176,3208,0.94 24,326645,172,2816,0.86 25,387484,175,5309,1.37 26,467004,180,6374,1.36 27,505518,150,3080,0.61 28,509298,177,2989,0.59 29,537334,173,3480,0.65 30,569868,176,4462,0.78 31,573802,161,5551,0.97
- load data infile "/var/lib/mysql-files/my.csv" into table my_table fields terminated by ',' lines terminated by '\n' ignore 1 rows;
Tabelle löschen
- drop table my_table;
Spalte hinzufügen
- alter table my_table add column test_p_1000 int(16);
Spalte entfernen
- alter table my_table drop column test_p_1000
Select mit Bedingung
- select * from my_table where tests > 500000;
Ausgabe nur gewisser Werte
- select kw,prozent from my_table where tests > 500000;
Order by
- select * from my_table where tests > 500000 order by labor;