Video: Qhov twg yog SQL * Plus hais kom ua?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
SQL*Plus yog a lus txib -line tool uas muab kev nkag mus rau Oracle RDBMS. SQL*Plus enablesyouto: Nkag mus thiab ua tiav SQL lus txib thiab PL/ SQL ntawv blocks. Format thiab luam cov lus nug.
Tsis tas li ntawd, kuv yuav siv SQL Plus li cas?
- SQL*Plus yog cov cuab yeej hais kom ua kab uas tau teeb tsa nrog OracleDatabase.
- Txhawm rau pib SQL*Plus, xaiv Khiav cov lus txib los ntawm Startmenu, nkag mus rau "sqlplus", thiab xaiv OK khawm.
- Txhawm rau txuas rau lub database, sau tus username thiab password.
- Txhawm rau khiav SQL nqe lus, ntaus nws, ntaus ib lub cim, thiab nias tus yuam sij Enter.
Ib yam li ntawd, kuv yuav tawm SQL Plus li cas? Rau tawm SQL * Ntxiv kab hais kom ua, nkag mus Tawm . Rau tawm lub Windows GUI, nkag mus Tawm los xaiv Tawm los ntawm cov ntawv qhia zaub mov. Ib SQL ntawv * Ntxiv , cov Tawm los yog QUIT commandhalts tsab ntawv tam sim no khiav, nws tsis xaus koj qhov kev sib tham.
Kuj Paub, SQL commands yog dab tsi?
Cov lus txib yog CREATE, ALTER, DROP, RENAME, thiab TRUNCATE. Data Manipulation Language (DML) - Cov no SQL lus txib yog siv rau khaws cia, rov qab, hloov kho, thiab tshem tawm cov ntaub ntawv. Cov ntaub ntawv Manipulation Language lus txib yog: SELECT, INSERT, UPDATE, thiab DELETE.
Oracle spool hais kom ua yog dab tsi?
Teb: Cov SPOOL hais kom ua ua rau SQL*Plus sau cov txiaj ntsig rau cov ntaub ntawv ntawm lub operating system. SQL> spool /tmp/myfile.lst.
Pom zoo:
Kuv yog leej twg hais kom ua hauv Unix nrog piv txwv?
Whoami hais kom ua hauv Linux nrog piv txwv. whoami hais kom ua yog siv ob qho tib si hauv Unix Operating System thiab nrog rau hauv Windows Operating System. Nws yog qhov tseem ceeb ntawm kev sib txuas ntawm cov hlua "leej twg", "kuv", "i" raws li whoami. Nws qhia tus neeg siv lub npe ntawm tus neeg siv tam sim no thaum cov lus txib no tau hu
Qhov twg SQL hais kom ua yog siv los iterate los ntawm txhua kab hauv tus cursor?
Hauv SQL Server tus cursor yog ib qho cuab yeej uas siv los iterate tshaj qhov tshwm sim, los yog mus voj los ntawm txhua kab ntawm qhov tshwm sim teeb ib kab ntawm ib lub sij hawm. Tej zaum nws yuav tsis yog txoj hauv kev zoo tshaj plaws los ua haujlwm nrog cov ntaub ntawv, tab sis yog tias koj xav tau voj kab los ntawm kab agonizing (RBAR) hauv T-SQL tsab ntawv ces tus cursor yog ib txoj hauv kev ua nws
Qhov twg ISPF hloov kab hais kom ua yog siv los ntxig ib kab ntawv tshiab?
Siv I lossis TE kab lus txib los ntxig cov kab tshiab, nyob nruab nrab ntawm cov kab uas twb muaj lawm lossis thaum kawg ntawm cov ntaub ntawv. Txhawm rau rho tawm ib kab, ntaus D hla tus lej mus rau sab laug thiab nias Enter. Txhawm rau txuag koj txoj haujlwm thiab tawm ntawm tus editor, ntaus END ntawm kab hais kom ua thiab nias Enter
Qhov twg yog ib qho kev hais kom ua sab hauv?
Hais kom ua sab hauv. Hauv DOS systems, ib qho lus txib sab hauv yog ib qho lus txib uas nyob hauv COMMAND.COM cov ntaub ntawv. Qhov no suav nrog DOScommands feem ntau, xws li COPY thiab DIR. Cov lus txib uas nyob hauv lwm cov ntaub ntawv COM, lossis hauv EXE lossis BAT cov ntaub ntawv, raug hu ua cov lus txib sab nraud
Qhov twg Geth hais kom ua yog siv los tsim ib tus account tshiab?
Lub ethereum CLI geth muab kev tswj hwm tus account los ntawm kev hais kom ua tus account: $ geth account [kev xaiv] [kev sib cav] Tswj cov nyiaj tso cai rau koj tsim cov nyiaj tshiab, sau tag nrho cov nyiaj uas twb muaj lawm, import tus yuam sij ntiag tug rau hauv tus account tshiab, tsiv mus rau cov ntawv tseem ceeb tshiab thiab hloov pauv. koj tus password