Cov txheej txheem:
- Ntsis Query kom tau tag nrho cov npe kab los ntawm cov lus database hauv SQL
- Cov nram qab no Microsoft SQL Server T-SQL cov lus nug sau tag nrho cov ntxhuav nrog kab thiab cov ntaub ntawv siv INFORMATION_SCHEMA saib cov ntaub ntawv database metadata:
Video: Yuav ua li cas thiaj nrhiav tau cov npe kab hauv cov ntaub ntawv?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
4 Teb. Koj tuaj yeem siv cov lus nug nram qab no los sau tag nrho kab los yog nrhiav kab hla cov rooj hauv a database . SIV AdventureWorks GO SELECT t. npe AS table_name, SCHEMA_NAME(schema_id) AS schema_name, c. npe AS column_name NTAWM sys. tables AS t INNER JOIN sys.
Ntawm no, kuv yuav ua li cas thiaj tau txais cov npe kab npe hauv SQL Server?
Ntsis Query kom tau tag nrho cov npe kab los ntawm cov lus database hauv SQL
- SELECT COLUMN_NAME.
- Los ntawm INFORMATION_SCHEMA. COLUMNS.
- WHERE TABLE_NAME = 'Koj Lub Npe'
- YUAV TSUM ORDINAL_POSITION.
Ib yam li ntawd, koj ua li cas lub npe kab hauv SQL? SQL Rename Kem Syntax
- ALTER TABLE "table_name" Hloov "kem 1" "kem 2" ["Data Type"];
- ALTER TABLE "table_name" RENAME COLUMN "kem 1" TO "kem 2";
- ALTER TABLE Cov Neeg Siv Khoom Hloov Chaw Nyob Addr char(50);
- ALTER TABLE Cov Neeg Siv Khoom RENAME COLUMN Chaw Nyob rau Addr;
Tsis tas li ntawd, kuv yuav ua li cas thiaj tau txais cov npe ntawm cov ntxhuav thiab kab hauv SQL Server?
Cov nram qab no Microsoft SQL Server T-SQL cov lus nug sau tag nrho cov ntxhuav nrog kab thiab cov ntaub ntawv siv INFORMATION_SCHEMA saib cov ntaub ntawv database metadata:
- USE AdventureWorks2008;
- SELECT SchemaName = c. table_schema,
- TableName = c.
- ColumnName = c.
- DataType = data_type.
- Los ntawm information_schema.
- INNER JOIN information_schema.
- ON c.
Kuv tuaj yeem tau txais kab npe ntawm txhua lub rooj hauv mysql li cas?
Hauv qab no Mysql lus nug yuav tau txais koj tag nrho tus rooj qhov twg teev kem tshwm sim hauv qee qhov database. SELECT table_name, column_name los ntawm information_schema. kab THAUM column_name LIKE '%column_name_to_search%'; Nco ntsoov, tsis txhob siv % ua ntej column_name_to_search yog tias koj paub cov pib cov cim ntawm qhov ntawd kem.
Pom zoo:
Kuv yuav ua li cas thiaj tsim tau ZIP cov ntaub ntawv nrog ntau cov ntaub ntawv?
Muab ob peb cov ntaub ntawv mus rau hauv ib qho zippedfolder kom yooj yim sib faib ib pawg ntawm cov ntaub ntawv. Nrhiav cov ntaub ntawv lossis nplaub tshev uas koj xav zip. Nias thiab tuav (lossis right-click) cov ntaub ntawv lossis ntawv tais ceev tseg, xaiv (lossis taw tes rau) Xa mus rau, thiab tom qab ntawd xaiv Compressed (zipped) folder
Yuav ua li cas thiaj nrhiav tau kuv cov keeb kwm kev tshawb nrhiav hauv Google?
Saib thiab tshem tawm kev tshawb nrhiav keeb kwm hauv GoogleChrome Mus saib lub vev xaib keeb kwm hauv Google Chrome, nyem qhib cov ntawv qhia zaub mov? ntawm sab xis saum toj ntawm nws lub qhov rais thiab xaivHistory, tom qab ntawd nyem Keeb Kwm thib ob
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Kuv yuav ua li cas thiaj tau txais cov npe ntawm kab hauv SQL?
Microsoft SQL Server Management Studio 2008 R2: Hauv cov lus nug editor, yog tias koj qhia cov ntawv ntawm lub npe lub rooj (ex dbo. MyTable) thiab ntaus ALT + F1, koj yuav tau txais cov npe ntawm kab npe, hom, ntev, thiab lwm yam
Kuv yuav nrhiav tau MX cov ntaub ntawv li cas rau ib lub npe?
Mus rau Start> Khiav thiab ntaus cmd. Ntawm qhov hais kom ua, ntaus nslookup, thiab tom qab ntawd nias Enter. Hom, qhov twg sau npe yog lub npe ntawm koj lub npe, thiab tom qab ntawd nias Enter. Cov ntaub ntawv MX rau lub npe koj nkag yuav tsum tau muab tso tawm